Si Johnson was a professional baseball player who played as a pitcher for various teams during his career. He was born on November 26, 1906, in Danville, Virginia, and began his baseball career in the minor leagues in 1927. He played for several minor league teams before making his major league debut in 1930 with the St. Louis Cardinals.

Johnson played for the Cardinals for three seasons before being traded to the Philadelphia Phillies in 1933. He played for the Phillies for four seasons and was known for his strong pitching performances. In 1934, he had a career-high 21 wins and was named to the National League All-Star team.

After his time with the Phillies, Johnson played for several other teams, including the Cincinnati Reds, Brooklyn Dodgers, and Pittsburgh Pirates. He continued to have success as a pitcher, and in 1943, he had a career-best 2.41 ERA while playing for the Pirates.

Johnson's career was interrupted by World War II, and he served in the military from 1944 to 1945. After his service, he returned to baseball and played for a few more seasons before retiring in 1947.

Throughout his career, Johnson was known for his strong fastball and his ability to pitch effectively in pressure situations. He finished his career with a record of 113 wins and 114 losses, a 3.92 ERA, and 1,012 strikeouts.

After retiring from baseball, Johnson worked as a scout for several teams, including the New York Yankees and the Baltimore Orioles. He also coached baseball at the high school and college levels.

Johnson passed away on December 9, 1962, at the age of 56. He was posthumously inducted into the Virginia Sports Hall of Fame in 1974.