 He was also the director of the Hospital for Joint Diseases and a member of the board of governors of the Stuyvesant Square Hospital.Simon was a member of the Empire State Luncheon Club, Westchester Country Club, Quaker Ridge Golf Club, Uptown Club and the National Democratic Club.Simon was also on the Board, and later served as Vice President of the Fifth Avenue Association, an influential group of public officials and Fifth Avenue merchants that included Ezra Fitch, Robert Adamson, Lucius M. Boomer, Eliot Cross, and other luminaries of the era.