Mohardt attended the University of Notre Dame from 1918 through 1921 where he played football under Knute Rockne and also competed in baseball and track and field. He was selected as an All-American halfback in 1921 but lost his last year of collegiate eligibility for participating in a professional football game against the Green Bay Packers in December 1921.

Mohardt played professional baseball for the Detroit Tigers for five games in April 1922 and also played in the minor leagues during the 1922 and 1923 seasons. He also played professional football in the National Football League for four seasons with the Chicago Cardinals (1922–1923), Racine Legion (1924), and Chicago Bears (1925). He shared the backfield with Red Grange in 1925.

After retiring from athletics, Mohardt became a medical doctor. He served as a lieutenant colonel in the U.S. Army Medical Corps during World War II in the North African and Italian Campaigns. He later became a surgeon at a veterans hospital and eventually the assistant director of the Veterans Administration's Surgical Service.

Mohardt was born in Pittsburgh, Pennsylvania in January 1898. His family moved to Gary, Indiana, while he was a child. At the time of the 1920 U.S. Census, Mohardt was living in Gary with his parents and nine younger siblings. Both of his parents were immigrants from Austria, and his father worked as a pipe fitter in a sheet mill.

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