[1] He served on the Scientific Advisory Committee for the Ballistic Research Laboratories at Aberdeen Proving Ground.

[2] In 1941, he became the assistant director of the Massachusetts Institute of Technology Radiation Laboratory and helped transform primitive radar into a reliable defensive and offensive military tool.

[3] He was chairman of the National Security Agency Scientific Advisory Board Panel on Electronics and Data Processing from its inception on January 27, 1959, until his death in May.

Ridenour led the development of airborne microwave radar nicknamed "Micky", which allowed bombing through clouds.

[6] Along with Gilbert W. King, Edwin L. Hughes, and George W. Brown, Ridenour patented an information storage system which combined optical disk storage of large capacity and a magnetic drum memory of low capacity.