John H. DeWitt Jr. (February 20, 1906 – January 25, 1999) was an American pioneer in radio broadcasting, radar astronomy and photometry.
He observed the first successful reception of radio echoes off the Moon on January 10, 1946, as part of Project Diana.
[citation needed] DeWitt began work at Bell Laboratories in Washington, D.C. the next year.
After the outbreak of the Second World War, he returned to Washington as a lieutenant colonel in the United States Army to work at the United States Army Signal Corps' Evans Signal Laboratories on radar.
[6] He retired from the Army in 1946 and worked for a year as a consultant to a Clear-channel station group, which was seeking approval for greater transmitter power.