Frank Sinkovitz

Frank Bernard Sinkovitz (May 20, 1923 – August 6, 1989) was an American football center and linebacker who played six seasons in the National Football League. He then worked as an umpire for 26 seasons, wearing uniform number 20, which was later worn by Larry Nemmers. He officiated Super Bowl XV. He was born in Steelton, Pennsylvania and died in Baltimore, Maryland.