Rocketdyne
The Rocketdyne Division was founded by North American Aviation (NAA) in 1955, and was later part of Rockwell International (1967-1996) and Boeing (1996-2005). In 2005, the Rocketdyne Division was sold to United Technologies Corporation, becoming Pratt & Whitney Rocketdyne as part of Pratt & Whitney. In 2013, Pratt & Whitney Rocketdyne was sold to GenCorp, which merged it with Aerojet to form Aerojet Rocketdyne.
Robert S. Kraemer
Robert Kraemer was hired by the rocket division of North American Aviation (later known as Rocketdyne) where he designed rocket engines. Kraemer served as the head of Advanced Design at Rocketdyne for over a decade, designing or overseeing the development of the engines that powered Jupiter, Thor, Atlas, and Saturn rockets.