He has worked with the Dutch Navy, the USAF and NASA.
He is the author of several books.
His first book, The Theory of Orbits, is an important text on orbital mechanics[?].
... 7.39% African American, 0.08% Native American, 1.62% Asian, 0.08% Pacific Islander, 5.94% from other races, and 2.43% from two or more races. 16.62% of the population ...