He served as an officer, reaching the rank of Lieutenant Colonel, with the United States Air Force. He asked Pal Benko, who had qualified for the 1970 Interzonal, to yield his spot to Fischer. Benko realized that Fischer had a much greater chance of winning and agreed, receiving a fee of $2,000.
Edmondson is also credited with greatly expanding the USCF. Edmondson served as Fischer"s manager during the 1970 Interzonal, and during his winning 1971 Candidates" matches against Mark Taimanov, Bent Larsen, and Tigran Petrosian.
Edmundson was born in Rochester, New York, and died in Honolulu.