Graduate level course work, research and/or experience in one or more of the following areas: orbital mechanics, astrodynamics, ascent trajectory modeling, hypersonic flight simulation, optimal control, proximity operations, cislunar trajectory design, tree search algorithms, flight mechanics, and/or trajectory modeling and simulation. Experience with nonlinear programming (non-linear programming), direct methods, gradient-based optimization, parameter optimization, genetic algorithms, evolutionary algorithms, heuristic optimization methods, indirect methods, and/or calculus of variations.