He was widely considered as a prospective candidate for Governor of New Jersey in 1918 but decided not to run. He was appointed U.S. Attorney for the District of New Jersey by President Woodrow Wilson in 1920. During his tenure he was associated with enforcing the federal law at the time against dissemination of motion pictures of a fight. The fight referenced was the Dempsey-Carpenter fight in Jersey City - July 1921. On December 16, 1921, then Attorney General Dougherty requested Geran's resignation. Stated reason was that the Attorney General desired a Republican hold the office. Geran resigned in 1921 and resumed the practice of law in Asbury Park, New Jersey.