Bruce Kison's journey in Major League Baseball began when he was drafted by the Pittsburgh Pirates in the 14th round of the 1968 MLB Draft. Standing at 6 feet 4 inches, Kison was known for his lanky frame and sidearm delivery, which made him a challenging opponent on the mound. His career took off when he made his debut with the Pirates in 1971, quickly establishing himself as a reliable pitcher.

Kison's rookie season was marked by a memorable performance in the 1971 World Series against the Baltimore Orioles. Despite being a newcomer, he was called upon in Game 4 and delivered an outstanding performance. Coming in as a reliever, Kison pitched 6 1/3 scoreless innings, helping the Pirates secure a crucial victory. His efforts contributed significantly to the Pirates' World Series win that year, earning him a place in the hearts of Pittsburgh fans.

Throughout his tenure with the Pirates, Kison was primarily utilized as a starting pitcher, though he occasionally came out of the bullpen. His ability to adapt to different roles made him a valuable asset to the team. Over the years, Kison developed a reputation for his competitive spirit and tenacity on the mound. He was known for his ability to pitch effectively under pressure, often delivering strong performances in critical games.

In 1979, Kison was part of another World Series-winning team with the Pirates. Although he did not play as prominent a role as he did in 1971, his presence on the roster added depth to the pitching staff. That season, the Pirates defeated the Baltimore Orioles once again, capturing the championship title.

After a decade with the Pirates, Kison signed with the California Angels as a free agent in 1980. His time with the Angels saw him continue to contribute as a dependable pitcher. Kison's experience and leadership were valuable to the Angels' pitching rotation, and he played a crucial role in helping the team reach the postseason in 1982. The Angels made it to the American League Championship Series that year, though they were ultimately defeated by the Milwaukee Brewers.

Kison's career with the Angels lasted until 1984, after which he joined the Boston Red Sox for his final season in 1985. Although his time with the Red Sox was brief, he brought veteran experience to the team. Kison retired from professional baseball after the 1985 season, concluding a career that spanned 15 years in the major leagues.

Throughout his career, Kison was known for his competitive nature and ability to perform in high-stakes situations. He finished with a career record of 115 wins and 88 losses, along with an earned run average (ERA) of 3.66. Kison's contributions to the teams he played for, particularly the Pittsburgh Pirates, left a lasting legacy in the world of baseball.

After retiring as a player, Kison remained involved in the sport, transitioning into coaching and scouting roles. His deep understanding of the game and experience as a player made him a valuable mentor to younger athletes. Kison's post-playing career included stints as a pitching coach and scout for various MLB teams, where he continued to share his knowledge and passion for baseball.