With Paul J. Cefola, Felix R. Hoots, and P. Kenneth Seidelmann from the United States, and Andrey I. Nazarenko, Vasiliy S. Yurasov, and Stanislav S. Veniaminov from Russia. Honored for their determination to transcend numerous limitations to collaboration, and their pioneering work advancing state-of-the-art space surveillance in the United States and Russia for the benefits of the worldwide astrodynamics community and the safety of human activity in space.