Raised in Haworth, New Jersey, Osmers attended the local public schools, graduating from Dumont High School before attending Williams College, in Williamstown, Massachusetts.

While a member of the Seventy-seventh Congress, Osmers enlisted as a private and graduated from the Infantry School at Fort Benning, Georgia, as a second lieutenant.

Osmers went on active duty as a second lieutenant in the Seventy-seventh Infantry Division on January 4, 1943, transferred to the Twenty-fourth Corps and served in the Pacific, and was discharged on February 22, 1946.

He was elected as a Republican to the Eighty-second Congress, by special election on November 6, 1951, to fill the vacancy caused by the resignation of Harry L. Towe, and was reelected to the six succeeding Congresses, serving from November 6, 1951, to January 3, 1965.

[6] This article incorporates public domain material from the Biographical Directory of the United States Congress