[1] In 1909, Heyman ran for the New York State Assembly as a Democrat in the Kings County 21st District.
[5] He served as a delegate to the 1915 New York State Constitutional Convention, by which point he was working in the real estate business.
[6] In 1915, Heyman was elected to the New York City Board of Aldermen over the Republican incumbent A. M. Levy, representing the 62nd Aldermanic District.
[7] He lost the 1917 re-election to Socialist Baruch Charney Vladeck, despite receiving support from the Republican Party in the election.
[14] Heyman was grand chancellor of the local Knights of Pythias lodge and the state field deputy, chairman of the board of directors of the Eastern District Boys' Association, a member of the Loyal Order of Moose,[14] the Odd Fellows, the Hebrew Mutual Benefit Society, the Hebrew Free Burial Society of Brooklyn, Order Brith Abraham, the Tambury Democratic Association, and the Wantagh Democratic Club, and the standard-bearer of the Harry Heyman Democratic Club of the 21st Assembly District.
[14] Special Sessions Justice Harry Howard Dale, County Clerk John N. Harman, Sewers Commissioner Joseph Lentol, and a delegation of employees in the County Clerk's office were among those who attended his funeral at the Kirschbaum Funeral Parlors.