Over twenty years’ experience as a contractor to defense, intelligence, and civilian space agencies, covering the full range of systems engineering from simulations supporting initial concept development to operational performance evaluation of delivered systems. Constructed, calculated, optimized, simulated, and solved mathematical models of orbit determination, satellite signal collection systems, logistics interdiction, air defense suppression, cloud forecasting, satellite weather measurement, space-to-ground laser communications, space vehicle reliability, and decision-making under complicated and uncertain conditions. Statistical analysis of experimental data, developing and documenting algorithms and software implementations, writing and presenting briefings on technical approach and results to customers, teaching and mentoring junior personnel.