He then entered private practice in Camden, New Jersey, where he was also the municipal solicitor for Bellmawr, Clementon and Voorhees Township, New Jersey.
He was an Assistant United States Attorney of the District of New Jersey from 1943 to 1945.
[1] On October 9, 1945, Madden was nominated by President Harry S. Truman to a seat on the United States District Court for the District of New Jersey vacated by Judge John Boyd Avis.
He served as Chief Judge from 1961 to 1968 and as a member of the Judicial Conference of the United States from 1961 to 1966, assuming senior status due to a certified disability on January 1, 1968.
[1] Madden served in that capacity until his death on March 29, 1976, at his home in Collingswood, New Jersey.