Inducted into the Jewish Sports Hall of Fame, 1990

Born in Hartford, Rosenbaum graduated from Weaver High School in 1929. He was on the All-State High School football team, and was considered one of its best players. He also earned letters at Weaver in basketball and baseball. He went on to William and Mary College for a year but suffered an injury that prevented him from continuing in football and he withdrew from the college the next year.

In the early 1930s he played semi-pro football for the Bristol West Ends, one of the best semi-pro teams in the state, for about six years. He worked at the Wiremold Corporation and played for years on their basketball team in the Industrial League, winning a championship in 1947 when he was 37 years old.

He assisted Fred Stone, the Athletic Director of Weaver High School, in coaching their football team, and was an afterschool athletic director for the Hartford Park Department in the North End.