John Van Ryzin was a game programmer in the classic Atari 2600 era. He worked at Activision and Absolute Entertainment. The following games have been credited to him. (Please /msg with any additions).
Gamelist
Cosmic Commuter for the
Atari 2600
F-18 Hornet for the
Atari 7800
H.E.R.O. for the
Atari 2600
H.E.R.O. for the
Atari 5200