Si Johnson, born Silas Kenneth Johnson on October 5, 1906, in Danway, Illinois, embarked on a lengthy career in Major League Baseball as a right-handed pitcher. His journey in the major leagues began with the Cincinnati Reds, where he debuted on April 17, 1928. Johnson quickly became a reliable presence on the mound, known for his durability and consistency over the years.

During his tenure with the Reds, Johnson developed a reputation for being a workhorse, often leading the team in innings pitched. Despite playing for a team that struggled during much of his time there, he managed to maintain respectable personal statistics. His perseverance on the mound was evident as he frequently faced some of the toughest hitters of the era.

In 1936, Johnson was traded to the St. Louis Cardinals, where he continued to demonstrate his pitching skills. His time with the Cardinals was marked by steady performances, and he played a crucial role in the team's pitching rotation. Johnson's ability to adapt and perform under pressure was evident as he faced the challenges of playing in a new league environment.

After his stint with the Cardinals, Johnson moved to the Philadelphia Phillies in 1940. With the Phillies, he continued to showcase his pitching abilities, often being called upon to pitch in difficult situations. His experience and knowledge of the game were valuable assets to the team, and he provided leadership to younger players on the roster.

Johnson's career extended into the early 1940s, a period when many players were leaving for military service during World War II. Despite the challenges posed by the war, he remained active in the league, contributing to his team's efforts on the field. His longevity in the game was a testament to his skill and determination as a professional athlete.

In 1946, Johnson joined the Boston Braves, where he played his final season in the major leagues. Over the course of his career, he accumulated a win-loss record of 101-165, with an earned run average (ERA) of 4.09 and 840 strikeouts. While his win-loss record might not reflect the talent he possessed, it is important to consider the context of the teams he played for and the era in which he pitched.

Si Johnson retired from professional baseball in 1947, leaving behind a legacy of perseverance and dedication to the sport.