GuideTech Team
James Cook
Co-Founder
President
James has 16 years of experience developing autonomous air-vehicles from concept-phase to successful flight-test demonstration. James serves as President of GuideTech and Software Architect. James served as GNC lead for Raytheon’s Active Protection System, System Performance Lead for Raytheon’s Joint Air to Ground Missile (JAGM), Modeling & Sim Lead for SNC’s Dream Chaser Space Plane, GNC lead for Stratolaunch Space Plane, Medium Launch Vehicle and Talon Hypersonic Research Vehicle as well as Guidance & Estimation lead for CURES counter UAS system developed by AFRL. James received his MS degree in Dynamics and Control from the University of Southern California and his BS degree in Aerospace from Iowa State University. He has 4 patents in missile guidance.
Rob Brinkerhoff
Co-Founder
Chief Strategist
As Chief Strategist at GuideTech LLC, I drive our progress by formulating and executing plans that leverage innovation and competitiveness. With a background as a seasoned Guidance Navigation and Control engineer in aerospace, I've led projects from design to flight testing. My technical expertise covers Terminal Guidance, Trajectory Shaping, Estimation, System Design, Performance Evaluation, and Systems Engineering. I hold a B.S. in Physics and an M.S. in Mechanical Engineering from the University of Utah. Before co-founding GuideTech in 2014, I spent 15 years at Raytheon, Tucson, contributing significantly to their engineering endeavors.
John Ottander
Chief GNC Engineer
John earned a BS in Aerospace Engineering from Boston University and a MS in Aerospace Engineering from Georgia Institute of Technology while working in Dr. Eric Johnson’s UAV Lab. John has 11 years of experience working on challenging projects involving Launch Vehicles, UAVs, and Missiles in the technical disciplines of Guidance, Navigation, and Control, Mission Analysis, Structural Dynamics Control, and Fluid Slosh. Before joining GuideTech, John worked as contractor at the NASA Marshall Space Flight Center where he served positions such as Liftoff Separation Lead and Ascent Flight Controls Lead for the Space Launch System in a mixed civil servant/contractor team. At NASA he earned a reputation of striving for technical excellence, openness, challenging assumptions, and finding bugs.
Doron Strassman
Senior Technical Advisor
A senior system designer with wide array of experiences, Doron enjoys undertaking a full range of engineering and product development challenges with emphasis on new business capture. Doron combines broad technical expertise with entrepreneurial skills and strategic planning. Thrives in team-work environment, and draws satisfaction from the teaching and sharing of knowledge and experience. Recent work experiences include strategic business capture through new initiatives system design and potential customer interface based on trust and technical and programmatic integrity. Possesses a proven record of new business capture. Has thorough experience in proposal leadership, program planning, program management and technical leadership. Earned Raytheon Missile and Defense Chief Engineering and Lead System Engineering certifications.
Kendel McCarley
Business Capture
Kendel McCarley, Program Manager and System Hardware Lead (GuideTech) - Master’s degree from the University of Arizona and work towards PhD in Hardware/Software Co-Design for Signal Processing applications, with minors in Optical Engineering and Computer Science. Prior to joining GuideTech in 2022, Kendel spent twenty years in Raytheon Missile Systems’ Advanced Programs division and another two years in Raytheon Intelligence & Space Advanced Electro-Optical group, where he focused on the creation of new sensing technologies tightly coupled with high performance embedded computing. Mr. McCarley has been principal investigator on multiple DARPA, AMRDEC, and ONR programs in secure processing, novel computing architectures, and autonomy. He was lead author and principal investigator for Raytheon’s proposal for DARPA Fast Event-based Neuromorphic Camera Electronics (FENCE). He maintains a Top Secret clearance through an agreement with Arizona Research Corporation.
Roger Beck
Engineering Fellow
Roger received his B.S., M.S., and Ph.D. in Aerospace Engineering from Virginia Tech where he worked in the Flight Simulation Laboratory. As part of his graduate research, Roger studied algorithms for Control Allocation--he revisited this work as a co-author of the textbook "Aircraft Control Allocation" (John Wiley, 2016). Prior to joining GuideTech in 2020, Roger spent 17 years working as a contractor working on a variety of NASA programs. He started his career as a support contractor at NASA Dryden Flight Research Center, where he was a member of the team doing Guidance, Navigation, and Flight Controls design and analysis for the successful X-43A flight tests. Other highlights include working on the Orion Pad Abort 1 test flight, the Mars Entry Air Data System flown on MSL, and post-flight trajectory estimation/reconciliation for multiple flight tests.
More recently, he spent 7 years as a contractor at the NASA Marshall Space Flight Center working on the Space Launch System Flight Mechanics Team. There he was cited for his ability to integrate complex multi-disciplinary problems and develop innovative approaches to visualizing and communicating key results. In recognition of his work on SLS, in 2019 Roger was presented the NASA Exceptional Engineering Achievement Medal.
Charlie Rush
Senior Principal GNC Engineer
Charlie earned a BS in Aerospace Engineering at Purdue University and a MS in Aerospace Engineering at the University of Arizona. He started his career in the flight controls department at Raytheon Missile Systems where he participated in several large proposal efforts and programs of record. He then worked for Teledyne FLIR Systems on their larger airborne surveillance product lines. Before joining GuideTech, he was as the Director of the Systems Engineering department which included control systems, navigation, optical design, sensor selection and image processing specialties. At GuideTech, Charlie has had the opportunity to participate in several flight control designs for launch and re-entry vehicles.
Ian Cohen
Engineering Fellow
Ian earned a BS and MS in Aerospace Engineering at the University of Maryland. He started his career in the Component Systems and Hardware Branch at NASA Goddard Space Flight Center, where he primarily worked GPS Navigation Software, Algorithms, Hardware Design and Integration. There Ian achieved a patent for Relative Navigation Using Reflective GPS, which flew on the Hubble Space Telescope Servicing Mission 4.
After leaving NASA, Ian worked at Raytheon Missile Systems developing software and algorithms for the Joint Air to Ground Missile (JAGM) and leading the captive flight software integration effort. Ian worked numerous other programs at Raytheon integrating and testing radar and sensor subsystems to include: Stormbreaker, Javelin, Low Active Sensor program and numerous other programs. Ian led the algorithm development and integration of time difference of arrival geolocation for multiple different sensors and subsystems. Prior to joining GuideTech Ian was selected as an Engineering Fellow and was the Chief Engineer in charge of the Advanced Composable Electronics IRAD, a next generation guidance common composable electronics stack for missile applications.
Chris Mickle
Engineering Fellow
Chris received his B.S. in electrical engineering at Lamar University and his M.S. and Ph.D. at Louisiana State University. He has over 22 years of experience as a GNC engineer at Raytheon, where he worked on autopilots, guidance design, simulation modeling, hardware testing, unit integration and flight test support. He supported the original Advanced Precision Kill Weapon System development. He was GNC/Software lead on the Griffin design, development, and transition to production where he led the integration onto fixed wing, rotary, ground, and naval launchers. He developed the GNC and led integration testing for the Pike Guided 40mm Grenade which successfully demonstrated seeker based guided flight in less than 18 months. He developed the GNC and led integration testing for both the Guided Multipurpose Munition as well as the Pike Guided 40mm Grenade. Additionally, he led GNC for the DARPA MAD-FIRE’s program.
In addition, he has supported concept development and provided subject matter expert support on many programs in Advanced programs including: UAVs, autogyros, missile defense, lunar explorers, and multiple missile concepts. He was promoted to Engineering Fellow in 2016. He developed and carried out several novel methods for integration testing including: Body Motion isolation testing, IMU characterization, bearing noise testing, and seeker characterization. Chris joined GuideTech in the summer of 2022 and is excited to apply his expertise to our numerous programs.
Tom Butler
Engineering Fellow
Tom earned his M.S in Electrical and Computer Engineering from the University of Arizona in 2008 and his B.S. in Electrical Engineering from the University of Nevada, Las Vegas in 2001. Prior to joining GuideTech, Tom was selected to be an Engineering Fellow at Raytheon Missiles and Defense (RMD) in Tucson, AZ. He served as the Systems Test Technical Lead for a major missile development program from 2018 to 2022, establishing critical test facilities for flight software and firmware integration and qualification. In prior positions at Raytheon, Tom was the Project Lead for the development of RMD’s common test systems software and one of the original authors of the radar sensor and environment model used to assess the performance of several franchise missile programs. During his career at Raytheon, Tom developed radar signal processing algorithms; radar target, terrain, and Electronic Attack (EA) models; and performance simulations for programs and Internal Research and Development (IRAD) projects. Tom co-authored a patent for Real-Time Radar Scene Generation in 2020.
James Longino
Senior Principal GNC Engineer
James earned as BS and a MS in Mechanical Engineering from the University of Colorado at the Boulder campus and has worked in Aerospace for 17 years, starting out with Boeing in the greater Seattle area. While at Boeing James worked on multiple different aircraft programs from the F22 to the 787 as a test engineer working on both ground and flight testing. In 2011, James joined the Dream Chaser program and let the development of the brake system and later the flight control system for the Engineering Test Article. He served as the lead mechanical systems flight controller for the two test drop tests conducted with the ETA aircraft. When Dream Chaser won the Cargo Resupply Contract 2 with NASA to develop the orbital capability of the Spacecraft to deliver cargo to the International Space Station James was selected to lead the development of the all the mechanical subsystem for the spacecraft. James has expertise in a wide range of areas related to the development of air and space craft, from Systems Engineering to mechanism design and control. James joined GuideTech to work on their expanding list of interesting and challenging programs
J. Pendleton
Senior Principal Systems Engineer
J. Pendleton is a multi-disciplined engineer with a cross-industry background in algorithms, architecture, hardware, software, and system design.
His specializations include cyber security, privacy engineering, anti-tamper, cloud computing, open architecture, artificial intelligence, machine learning, autonomous systems, and project management.
Billy Barr
Senior Principal Software Engineer
Billy earned a B.S. in Computer Engineering from the University of Arizona. He has spent his career working mostly on embedded systems including safety critical systems for medical and flight. He has been involved from proposals all the way through product verification and delivery. His work spans many engineering disciplines including software, electrical design/assembly/test/verification, systems requirement development, systems requirement decomposition for both software and hardware implementation and Integration, Verification and Validation (IV&V).
Billy spent 16 years at Tucson Embedded Systems working on a wide spectrum of embedded systems including Fully Autonomous Digital Engine Controllers (DO178 Level A development and verification), aircraft oxygen system controllers, BSP development for custom hardware (Integrity, Velocity, MicroC/ OS-II, eCos and VxWorks), mining asset tracker using wireless mesh network, Digital Engine Controller for industrializing TF40 engines to fracking and power generation and other miscellaneous projects. After TES, Billy worked from Raytheon Missile Systems for 7 years doing embedded software, firmware and systems design focused mostly on platform enablement and verification.
Matt Carpenter
Senior Principal Engineer
Matt has worked in the aerospace industry since graduating with a B.S. in Electrical Engineering from Brigham Young University in 2005. He is a multi-disciplined engineer with experience in high-fidelity aerospace modeling and simulation, data and performance analysis, GNC algorithms, as well as building continuous integration and testing environments for software development. His experience includes leading several cross-disciplined teams in Guidance, Simulation and DevOps. Matt loves developing software to identify and solve problems in highly complex environments, and is excited to apply his skills to GuideTech’s programs.
Brenton Kollinger
Principal Engineer
Brenton earned his M.S. in Aerospace and Mechanical Engineering from the Florida Institute of Technology in 2010 and his B.S. in 2006. He worked over 10 years for Raytheon Technologies as a Systems/Software Engineer developing Hardware-in-the-Loop test platforms for a variety of Missile and Defense programs. In addition to his Missile Systems Integration experience, he also developed training software and videogames for Raytheon Intelligence and Information Services. Prior to joining GuideTech Brenton served as the Software Lead for a new multi-program Hardware-in-the-loop facility capable of exercising missile embedded software and radar signal processing algorithms, in real-time, on tactically representative hardware.
Joe Weaver
GNC Engineer
Joe earned a B.S. in Aerospace Engineering from the University of Kansas and worked in the Composites Laboratory during his time as an undergraduate. He has 6 years of industry experience focused on Modeling and Simulation for a variety of different flight vehicles, including small UAS, fixed wing aircraft, glide weapons, missiles, and hypersonic vehicles. These efforts have supported R&D projects, test platforms, established programs, future concepts, and requirements development. During his career, Joe has grown expertise in guidance, controls, software development, and hardware integration, and he has participated in several successful flight tests during his career. He joined GuideTech in 2019 and brings a desire to take on difficult challenges, find innovative solutions, and have a bit of fun along the way.
Dane Childers
GNC Engineer
Dane earned a BS in Aeronautics and Astronautics from MIT in 2008. Upon graduation, he was hired as a civil servant at NASA’s Marshall Space Flight Center within the Guidance, Navigation and Mission Analysis Branch where he worked for nearly 12 years performing high fidelity dynamics Modeling and Simulation and simulation software development, primarily in the area of liftoff, separation/staging and jettison events for the Space Launch System. At the time of his departure, he held the roles of Liftoff and Separation Dynamics Team Lead – managing a team of 5-10 engineers - and Space Launch System Vehicle Management to Booster Element Discipline Lead Engineer, earning several Agency and Center level awards including a NASA Early Career Achievement Medal and a NASA Exceptional Engineering Achievement Medal. Dane left NASA to briefly work at Dynetics on the Flight Dynamics & Design Team doing mainly Modeling and Simulation on projects such as Human (Lunar) Lander System and DARPA OpFires, before joining GuideTech in the Fall 2021.
Grey Davis
GNC Engineer
Grey received a B.S. in Aerospace Engineering from the University of Tennessee. His 5 years of experience have included composites manufacturing and a diverse selection of Modeling & Simulation projects involving missiles, rotorcraft, fixed-wings, submarines, optics, and biological systems. Prior to joining GuideTech in 2021, Grey was at BAE Systems leading the development of an M&S framework which quickly found widespread adoption among new programs. While there his work earned a reputation for high quality and prompt delivery. Grey brings an enthusiasm for diving into any unfamiliar territory where there are opportunities for both learning and creative problem solving.
Leeanna Dobbs
GNC Engineer
Leeanna earned a M.S. in Aerospace Engineering from Mississippi State University in 2016. She served as a technical lead for the DARPA Gremlins program’s capture device while at Dynetics. Her role included flight test support, multi-vehicle control station operator, avionics integration, HWIL testing, and multi-disciplinary coordinating. Before that, Leeanna assisted in the development of the Shadow UAV Trainer creating physic based simulations using Simulink, Matlab, and C/C++, as well as serving as Scrum Master and product owner. Other projects have included HWIL integration for production, GPS integration testing, and sUAS flight test support. She enjoys everything aerospace, and her broad background brings a unique perspective to our solutions.
Spencer Rodgers
GNC Engineer
Spencer received a B.S. in Physics from the University of Kansas and is a Part 107 certified UAS operator. As an Integration and Test specialist, Spencer assists with UAS build, hardware integration, tooling development, flight test operations, model validation and system identification. Spencer developed a python aerodynamic estimation and aero database generation tool for fixed-wing UAVs using AVL and other panel method codes. Spencer has a unique ability to tackle complex multi-disciplinary problems. His thoughtful thorough approach brings precision to our flight-test operations.
George Pence
Software Engineer
George served in the United States Navy for 10 years maintaining and operating submarine weapons control systems, to which he attributes his strong work ethic, discipline, and integrity. George received a B.S. in Computer Engineering from the University of Memphis. After his Navy service, George entered the tech industry focusing on software development. He has rich experience set, including: low-level embedded development utilizing avionics standards, Real-Time Operating Systems, modeling & simulation, testing automation, and other development roles in projects using C/C++, Python, and C#. George has an enthusiasm for the highly technical nature of software development and the unique problem solving challenges and opportunities that it brings.
Jordan Freeman
Software Engineer
Jordan earned a B.S. in Computer Engineering at Mississippi State University. He has experience in embedded software development creating software for products ranging from telecommunications networking equipment to unmanned aerial vehicles. Before joining GuideTech in 2022, he served as a software quality assurance engineer for the Dynetics Human Landing System and provided software support for related space projects. Thanks to his experience working on and developing for safety critical projects, he brings a unique perspective on creating and modifying software in a safe, efficient way.
Will Bickett
GNC Engineer
Will holds a M.S. in aerospace engineering from the University of Alabama in Huntsville in addition to bachelor's degrees in both aerospace engineering and physics from Auburn University. He has focused much of his career on aerospace modeling and simulation, developing 6DOF simulations for a variety of unmanned platforms as well as conducting flight and software test operations for those vehicles. Recently, he has led efforts related to spacecraft mission design, orbital analysis and optimization, GNC development and testing, and creating visualizations for simulation environments. Other projects have involved lethality estimation, fragment tracking algorithms, radar signature analysis, and scene generation. He has also conducted academic research in the fields of atomic, nuclear, and space physics. Will is passionate about understanding how all sorts of systems work and how to describe them. He hopes to use his knowledge and skills to further the exploration and traversal of space.
Matt Zollinger
GNC Engineer
Matthew earned a B.S. in Aerospace Engineering from Embry-Riddle Aeronautical University. His experience includes modeling and simulation of fixed-wing aircraft and their systems, system integration, and flight test. Prior to joining GuideTech in 2022, he supported the development of a new unmanned aircraft system by developing the hardware-in-the-loop simulation and developing and performing lab and flight tests with the system. He enjoys developing innovative solutions to challenging problems and supporting the development of aerospace systems.
Nate Reed
GNC Engineer
Nate earned a BS in Aerospace Engineering from Auburn University in 2019. For the next three years, he worked as a modeling and simulations engineer for Dynetics with a focus on small, fixed-wing UAVs. His experiences include development of many complex software- and hardware-in-the-loop simulations, as well as UAV design support, hardware integration, performance evaluation, and testing. At the time of his departure, Nate was helping finish development of the Shadow UAV Trainer simulation, working primarily to polish autopilot behavior, optimize navigation logic, and improve model accuracy. Nate joined GuideTech in early 2022, excited by the opportunity to work challenging projects and learn new skills.
Jackson Sabol
GNC Engineer
Jackson graduated from the University of Kansas in 2021 with a B.S. in Physics. During his time as an undergrad, he spent over a year working on the RBSPICE SOC team with NASA’s Van Allen Probes. He is deeply passionate about anything relating to science, but as a fan of science fiction, space travel has always been of particular interest to him. His other projects include a wide range of subjects, from developing machine learning models that calculates the relative motion of distant galaxies to making a physics education web game. Jackson joined GuideTech in early 2022 and is excited at the opportunity to learn new skills.
Mike Warren
GNC Engineer
Mike graduated from the University of Kansas in 2022 with a B.S. in Aerospace Engineering. While there, he completed several successful flight tests on fixed-wing UASs. He has experience with classical and optimal control development, system estimation, and sensor testing. He is excited to work on both endoatmospheric and exoatmospheric vehicles, and he enjoys facing challenging problems. Mike joined GuideTech in the Summer of 2022 and is eager to learn and grow professionally.
Julian Moreno
GNC Engineer
Julian served 5 years in the United States Marine Corps as a small arms technician. In 2022, he received his B.S. in Aerospace Engineering with a focus in flight dynamics and flight controls from the University of Kansas. During his time as a researcher at the KU Flight Research Laboratory, Julian gained experience with modeling and simulation, machine learning, the development & integration of guidance and flight control algorithms, and small UAS flight testing. He has experience using a wide range of software tools including Python, MATLAB, and C++. Julian joined GuideTech in 2022, and is excited to contribute to the success of future projects.
Joe Kezon
GNC Engineer
Joe earned a B.S. in Aerospace Engineering from Purdue University, where he is currently pursuing an M.S. in Aerospace Engineering. Prior to joining GuideTech in 2022, he worked as an aerospace engineer focused on modeling and simulation, where he supported software- and hardware-in-the-loop simulations for multiple Army UAS programs, hardware-in-the-loop simulations for a crewed lunar lander program, and model-based design for flight software development and deployment for a high-speed experimental vehicle. Joe has a passion for digging deep into complex problems in order to find the best solution possible, learning as much as he can along the way.
Joe Wimmergren
GNC Engineer
Joe earned a BS in mathematics from the University of Kansas where he was heavily involved in research. Using data from the MAVEN and Juno spacecrafts, he modeled various chemical and physical processes in the atmospheres of Mars and Jupiter. He concurrently studied partial differential equations and focused on novel uses of the Unified Transform Method in nonlinear optics. He then went on to the University of Michigan as an applied math PhD student, where he worked on large-scale computational neuroscience problems. While he showed success as a PhD student, he was motivated to join GuideTech in 2022 by his love of modeling and simulation work, coupled with his desire to solve interesting and applied problems in aerospace once more. Joe is passionate about his work and is excited to continue learning from and collaborating with others.
Robert Tagtmeyer
GNC Engineer
Robert has been in the aerospace industry since graduating from Arizona State University with a B.S. in Astrophysics and a B.S. in Supply Chain Management. He worked at Raytheon Missiles and Defense in procurement of machined components, composites, containers, and launchers for several years before pursuing his M.S. in Aerospace Engineering from the University of Colorado, Boulder. Upon graduation he worked for Raytheon within the Guidance, Navigation, and Control department gaining experience with system performance, algorithm development, and simulation.
George Jeffrey Geier
Technical Advisor
Navigation
Mr. Geier retired as an Engineering Fellow at Raytheon Missile Systems, where he led navigation efforts in a number of applications, including: navigation Monte Carlo and covariance analysis in support of multiple programs; math models for multi-antenna arrays to assess GPS performance in jamming environments; RTK algorithm development in support of precise relative positioning applications; multi-ship jammer geolocation analysis for an IRAD effort. In addition, Mr. Geier taught “Introduction to Inertial Navigation” and “Introduction to GPS” at the Raytheon Learning Institute.
Prior to Raytheon, Mr. Geier spent more than 36 years with integrated navigation systems, GPS navigation and signal processing, and GPS Anti-Jam (AJ) analysis and integrity monitoring. His past experience in GPS/INS integration includes both military (Draper Laboratory, TASC, Intermetrics, and The Aerospace Corporation) and commercial (Trimble and Motorola) applications. At Motorola, he led efforts to integrate their GPS receiver technology with dead-reckoning sensors for automotive applications and designed signal processing approaches for cell phone integration of GPS. He was appointed to Motorola’s Science Advisory Board in recognition of his technical leadership.
Mr. Geier is a member of the Institute of Navigation and the Institute of Electrical and Electronics Engineers and holds 38 navigation-related patents. He received his BS and MS degrees in Aeronautics and Astronautics from MIT, and is a former instructor for NavTech Seminars, where he taught a two-day course in GPS/INS integration nationwide for ten years. He is also a co-author of Understanding GPS: Principles and Applications, ArTech House, first and second editions.
Roger Mason
Technical Advisor
Navigation
Roger received his B.S. in Electrical Engineering from the University of Utah and his M.S. from Stanford University. After graduating Stanford, he started work at Hughes Aircraft Company in Tucson, Arizona which was latter purchased by Raytheon. After 35 years of service in the Guidance, Navigation, and Control Center, he retired as an Engineering Fellow.
At Raytheon, he managed the TOW missile hardware in the loop lab, were he was responsible for the design and verification of the guidance and control software before becoming involved in Navigation. Some of his accomplishments include the development of several 6-DOF simulations including the TOW, FOG-M, and the Tomahawk Block four missiles. Was the team lead for the Tomahawk Navigation sub-system design which included the design and software development for the navigation code to process the IMU measurements, and the Kalman filter to blend GPS, Barometric altimeter, Digital Scene Matching Area Correlator (DSMAC) and Terrain correlation measurements (TERCOM). He also served as the hardware interface technical lead for the GPS anti-jam receiver development. He led the technical team to perform system integration and testing of the Navigation sub-system including both hardware-in-the-loop simulation as well as Van testing. He was a member of the Tomahawk first flight test team, responsible for navigation.
Other activities include the developed a transfer-alignment package for the Paveway missile; developed of the Navigation Software for both the APNT and SM3 missile programs; and modification to the Tomahawk Block III software to allow a differential GPS solution using a DSMAC measurement to extend the maximum stand-off distance by a factor of ten.
Cassie Ottander
Administrator
Cassie graduated from the University of Tennessee, Knoxville in 2006 with a BS in aerospace engineering. Prior to joining GuideTech in 2022, she worked for Raytheon Missile Systems and Dynetics. She currently serves in several volunteer leadership roles in the Huntsville, AL area.