[1] He was named a finalist for the 2020 class of the Pro Football Hall of Fame as a contributor, however he was not elected.
[5] In 1943, he graduated from St. John's University with a degree in accounting and then served during World War II in the 88th Infantry Division where he was hit by shrapnel in Italy.
[3] He worked as an accountant after the war and in 1948 took a position with the Elias Sports Bureau, the official statistician of the National League, where he had interned during college.
[4] Under Siwoff, the company was known for providing more obscure facts (day/night games, performance against left/right-handed pitchers, home/away, and with runners in scoring position), foreshadowing the modern era's advanced statistics.
[4] Siwoff expanded the company into providing statistical support to the NFL, NBA, WNBA, Major League Soccer, and various television and radio networks.