 He worked on the design of the Douglas B-42 and Douglas B-43 bombers, the Honest John, Nike-Ajax, and Nike-Zeus missiles, the Thor IRBM, and on parts of the Strategic Defense Initiative.In later years he worked on space-launch vehicles and was a proponent of Single-stage-to-orbit (SSTO) designs.He was honored in 1995 by the National Space Society for lifelong contributions to the technology of spaceflight.