Stan Jonathan was drafted in the 5th round (86th overall) of the 1975 NHL entry draft by the Boston Bruins. Jonathan started his NHL career with one game in the 1975–76 NHL season, before being called up permanently for the 1976-77 season. He typified Bruins Hockey, displaying both outstanding offensive ability and toughness. 1977-78 was his most productive season as he scored 27 goals with 25 assists. He also had 116 penalty minutes that year, making him a fan favorite. That year he won the Bruin's "7th Player Award" voted on by the fans for the player who exceeded expectations. His 78-79 season was shortened by an injury, but Jonathan returned the following year scoring 21 goals and 19 assists. He also added 208 penalty minutes and his role as a fighter began to overshadow his other talents.
The Bruins traded him to the Pittsburgh Penguins on November 8, 1982, and he retired after the 1983 season. He finished his NHL career with 91 goals and 110 assists in 411 games.
He is a full-blooded Native Canadian.