Kressel joined
RCA Laboratories in 1959, and spent 23 years there. He was in charge of development and commercialization of research developments in a variety of fields including light sources, light detectors, and integrated circuits. The development of the first practical
laser diodes and the first
epitaxial silicon
solar cell are also attributed to him. He eventually became vice president of solid-state electronic research and development. Kressel joined
Warburg Pincus in 1983. ==Memberships and awards==