Jean Albert Kéchichian is a retired engineering specialist at The Aerospace Corporation. He has made lasting contributions in astronautical guidance and astrodynamics over the past 25 years. His extensive involvement in NASA's interplanetary and planetary missions include the design of the orbit sustenance maneuvering strategies of the TOPEX spacecraft, the design of the turn and orbit change maneuvers of the Active Magnetospheric Particle Tracer Explorers (AMPTE) , direct support of the Pioneer Venus Orbiter mission operations, and the Galileo Probe trajectory reconstruction accuracy analysis. His software has been used by The Aerospace Corporation to fly actual spacecraft to the GEO orbit using optimal low-thrust transfer trajectories. He is also the recipient of a NASA/JPL invention citation mentioned in the NASA Tech Brief Vol. 11, No. 3, Item 66, March 1987, for providing the solution of fuel-optimal east-west station-keeping of geostationary spacecraft subject to daily momentum wheel dumps. Dr. Kéchichian received his Engineer's degree in Aeronautical Engineering from the Universite de Liege in Wallonie, Belgium in 1971, and his MS in Mechanical Engineering from the University of California at Berkeley in 1976. In 1977, he received his PhD in Aeronautics and Astronautics from Stanford University. From 1979 to 1987, Dr. Kéchichian was a Maneuver and Orbit Determination Analyst at JPL. From 1987 to 1989 he worked as a Senior Engineering Specialist at Ford Aerospace. Dr. Kéchichian then worked as an Engineering Specialist at The Aerospace Corporation from 1989 until his retirement. He is also the author of Applied Nonsingular Astrodynamics, Cambridge University Press (2018), Orbital Relative Motion and Terminal Rendezvous, Springer (2021), and Analytic Methods of Orbit Prediction and Control: Low-Thrust and Impulsive Propulsion Applications, AIAA (2023).