He was the longtime baseball coach at Dorsey High School of Los Angeles, his alma mater, then spent 31 seasons (1968–98) as head coach of baseball at Mount San Antonio College of Walnut, California, where his teams won 709 games and had only two losing campaigns.

[2] After Dorsey High School, he graduated from the University of Southern California, where he was an All-American and the second baseman on the Trojans' 1948 national championship team.

He threw and batted right-handed and was listed as 5 feet 10 inches (1.78 m) tall and 170 pounds (77 kg).

[3] Mazmanian's six-year playing career (1949–54) was largely spent in the New York Yankees' farm system, including 2½ seasons at the Triple-A level with the Kansas City Blues of the American Association.

[3][4] In 1984, he took a leave of absence from the Orioles to serve as an assistant coach for the United States Olympic Baseball Team.