During World War II, he became an attorney in the Office of the Administrator of Export Control in Washington, D.C. in 1941, and then a senior attorney of the Office of Production Management and later the War Production Board in Washington, D.C. from 1941 to 1942.
[1] Van Dusen was nominated by President Dwight D. Eisenhower on March 20, 1955, to a seat on the United States District Court for the Eastern District of Pennsylvania vacated by Judge Guy K. Bard.
He was confirmed by the United States Senate on July 29, 1955, and received his commission on August 1, 1955.
[1] Van Dusen was nominated by President Lyndon B. Johnson on January 16, 1967, to a seat on the United States Court of Appeals for the Third Circuit vacated by Judge James Cullen Ganey.
His service was terminated on May 26, 1993, due to his death in Bryn Mawr, Pennsylvania.