[4][5] He also contributed a chapter supporting the methodology behind Alfred C. Kinsey's sexual behavior studies to the book "Sex Habits of American Men" in 1948.
[6][7] Crespi left Princeton to work for the United States government, surveying European public opinion in postwar Germany.
He returned to Washington in 1954 to head a worldwide program of opinion surveys for the newly-formed United States Information Agency, where he would work for 32 years.
[8] In 1962, Crespi received a Superior Service Award from USIA Director Edward R. Murrow for “making a unique and original contribution to the conduct of United States foreign information activities by his pioneering use of surveys.” From 1955–1956 he also served as President of the World Association of Public Opinion Research.
His most widely reported work was a survey of French and British opinions about the US and Soviet Union, which was leaked to the New York Times and printed in its entirety on October 27, 1960, less than 2 weeks before the 1960 US Presidential election.