Reiss was a member of the New York County Lawyers' Association and the New York County Republican Committee. He was a director, officer, and counsel of the Jewish Home for Convalescents.[1] He also served as its president, and in 1932 he was honored for serving with the Home for eighteen years.[4]
Reiss died from falling or jumping from his room in the Pierrepont Hotel in Brooklyn on March 17, 1949. He was staying in the hotel since his sister, his last surviving relative, died in May 1948.[4] He was buried in Mount Hebron Cemetery.[5]