SUMMARY OF QUALIFICATIONS
Accomplished guidance, navigation, and control engineer with 17 years of research and industrial experience designing, implementing, and testing algorithms, software, and simulation tools for space vehicles. Proven track record of leading the technical effort to implement GN&C subsystems from preliminary design through integration and test for new space companies and NASA. Significant projects include:
* Designed and coded the on-board attitude determination and orbit navigation modules for the Cygnus advanced maneuvering spacecraft, which has flown several successful missions to the ISS.
* Developed the GN&C subsystem architecture and 6-DOF simulation environment for the Bigelow B330 space habitat.
* Designed the attitude determination and control system for NASA Goddard's Magnetospheric Multiscale Mission (MMS), a constellation launched in 2014 and currently operational.
* Acted as one of the original architects of the attitude determination and control system design now used on Orbital Sciences' entire fleet of successful GEOStar commercial geosynchronous communications spacecraft.
AREAS OF EXPERTISE
• Spacecraft Attitude Control and Estimation • Modeling and 6-DOF Simulation
• Nonlinear and Robust Control • Trajectory Optimization
• Mission Operations • Orbit Determination
• Structural Dynamics • Kalman Filtering
• Flight Software Development • MATLAB/Simulink, C/C++, UML, Unix, SVN, CVS, Git
Lead Engineer, Avionics Group
Firefly Space Systems - Austin, TX
March 2016 to Present
* Lead engineer for the Alpha launch vehicle autonomous flight termination system (AFTS). Manage schedule, manpower, and budget.
* Develop AFTS architecture, define subsystem requirements, perform hardware component trade studies, and code safety-critical software.
* Interface with the FAA and RCC to acquire launch license.
Guidance, Navigation, and Controls Subsystem Lead
Bigelow Aerospace - Las Vegas, NV
January 2015 to January 2016
Bigelow B330 Space Habitat
* Acted as sole GN&C subsystem engineer in the company. Defined GN&C concept of operations, system architecture, and requirements.
* Developed a 6-DOF simulation and analysis tool from the ground-up. Designed propellant optimal phase-plane attitude controller.
Bigelow Expandable Activity Module (BEAM)
* Developed mathematical model of BEAM deployment dynamics and performed monte carlo analyses.
* Gained approval from the NASA Space Station Program Control Board (SSPCB) that BEAM may safely deploy on the ISS.
* Authored the procedure that was used by the ISS astronauts to expand BEAM on-orbit.
Sr. Principal Engineer, GN&C Group
Orbital Sciences Corporation - Dulles, VA
March 2009 to March 2013
Gravity and Extreme Magnetism Small Explorer (GEMS) Spacecraft
* Lead GN&C analyst for the GEMS program. Directed the on-board attitude control, estimation, and orbit determination design.
* Successfully led the GN&C subsystem development through the critical design review milestone ahead of schedule and under budget.
Cygnus Advanced Maneuvering Spacecraft
* Designed, coded, and tested the on-board attitude determination and orbit navigation modules. Flight code was written in C++ using a UML framework.
* Vehicle has flown several successful missions to the ISS.
Sr. Principal Engineer
NASA Goddard Space Flight Center (Contractor) - Greenbelt, MD
January 2008 to March 2009
Magnetospheric Multiscale Mission (MMS)
* Developed the 6-DOF, high-fidelity simulation tool used for the MMS constellation control system design.
* Designed the primary on-board attitude determination system.
* Spacecraft was launched in 2014 and is operational.
Sr. Principal Engineer, GN&C Group
Orbital Sciences Corporation - Dulles, VA
1998 to 2008
Contributed to the attitude determination and control design of most Orbital Sciences' spacecraft over a 14-year period. Have performed roles as both lead GN&C subsystem engineer and technical expert. Highlights include:
Lead Attitude Control System Engineer, NSS-9 Spacecraft
* Acted as lead ACS subsystem engineer for the NSS-9 geosynchronous commercial communications spacecraft, currently operational.
* Managed analyses required for milestone reviews, software verification testing, schedule, and budget.
Far Ultraviolet Spectroscopic Explorer (FUSE) Spacecraft
* Devised innovative, real-time optimal slew guidance algorithm which enabled science mission to continue well past design life and after three out of four reaction wheels had failed.
* Optimal slew guidance scheme increased feasible science target window from 1% to 70% of nominal mission window.
GEOStar Commercial Communications Satellites
* Designed and implemented the primary and back-up gyroless attitude determination system for Orbital's first three-axis stabilized commercial communications satellite.
* Attitude control and estimation design is now being used on Orbital's entire product line of orbiting geosynchronous communications spacecraft.
Sensor Calibration Software Package
* Developed an alignment Kalman Filter tool used to estimate on-orbit sensor alignment and biases in redundant gyros and star trackers from telemetry.
* Ground software has successfully been used to calibrate the Orbview-3, DAWN, AIM, and NuSTAR spacecraft.
* Led the development of the image mode command software in the mission planning system.
* Spacecraft began acquiring 1 meter panchromatic and 4 meter multispectral imagery in 2003.
Engineer, Structural Dynamics Group
General Dynamics Space Systems - San Diego, CA
1989 to 1992
Member of the team which designed the Atlas/Centaur class commercial launch vehicles. Performed spacecraft coupled loads analyses using NASTRAN and DMAP. Developed a 6-DOF analysis tool used to compute launch vehicle and spacecraft loads during critical maximum dynamic pressure gust event.
1998 Aerospace Engineering (Control Theory)
Doctor of Philosophy, - The University of Texas at Austin, Austin, TX
* Dissertation: Linear Parameter Varying Representations for Nonlinear Control Design
* Performed doctoral research under Jeff Shamma.
* Coursework included all topics in applied mathematics, statistical estimation theory, robust & optimal control, and flight dynamics.
1988 Aerospace Engineering
Master of Science, - Virginia Polytechnic Institute & State University, Blacksburg, VA
1987 Aerospace & Ocean Engineering
Bachelor of Science, - Virginia Polytechnic Institute & State University, Blacksburg, VA
L. Carter and J. Shamma, Gain-Scheduled Bank-to-Turn Missile Autopilot Design Using Linear Parameter Varying Transformations, AIAA Journal of Guidance, Control, and Dynamics, Vol. 19, No. 5, Sept.-Oct. 1996.
* Certificate of Appreciation, Radarsat-2 Program, Orbital Sciences Corporation.
* Graduate Research Fellowship, Air Force Office of Scientific Research.
* University Fellowship Award, The University of Texas at Austin.
* Pacesetter Award, General Dynamics Space Systems Division.
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