Peter Cusick was born in California in 1910. A strong supporter of the Allied cause during the Second World War he helped form the Fight for Freedom group. He became Executive Secretary and other members included Allen W. Dulles, Joseph Alsop, Henry Luce, Dean G. Acheson, James P. Warburg, Marshall Field III, Fiorello LaGuardia and Ralph Ingersoll. At its peak, the FFF headquarters at New York City, 1270 Sixth Avenue, had an office staff of twenty-five.

The Japanese Air Force attacked Pearl Harbor on 7th December, 1941 and the Fight for Freedom group closed soon afterwards. Cusick joined the United States Army and was decorated with the Croix de Guerre by General Jean LeClerc of the Free French Armed Forces.

According to the New York Times, after the war Cusick was a private consultant on government and foreign affairs and was a member of the Council on Foreign Relations.

Peter Cusick died of a heart attack in Manhattan in September 1982. Cusick was survived by his wife, Edla, two children, Michael and Missy, and three grandchildren.