Ryan Dempster is a former professional baseball player who played as a pitcher in Major League Baseball (MLB) for 16 seasons. He was born on May 3, 1977, in Sechelt, British Columbia, Canada. Dempster began his baseball career in the minor leagues in 1995 after being drafted by the Texas Rangers in the third round of the MLB draft.

Dempster made his MLB debut in 1998 with the Florida Marlins, where he played for four seasons. He then played for the Cincinnati Reds for two seasons before being traded to the Chicago Cubs in 2004. Dempster played for the Cubs for nine seasons, becoming one of the team's most reliable pitchers. He was named an All-Star twice during his time with the Cubs, in 2008 and 2011.

In 2012, Dempster was traded to the Texas Rangers, where he played for half a season before being traded again to the Boston Red Sox. He played a crucial role in the Red Sox's 2013 World Series championship, pitching in relief during the playoffs. Dempster announced his retirement from baseball in 2014.

Throughout his career, Dempster was known for his versatility as a pitcher, having played as both a starter and a reliever. He had a career record of 132-133 with a 4.35 earned run average (ERA) and 2,075 strikeouts. Dempster was also known for his sense of humor and his charitable work off the field.

In addition to his baseball career, Dempster has also worked as a television analyst for MLB Network and as a special assistant for the Chicago Cubs. He has also been involved in various charitable organizations, including the Dempster Family Foundation, which supports children with 22q11.2 deletion syndrome, a genetic disorder that his daughter has.

Overall, Ryan Dempster had a successful career as a pitcher in MLB, playing for several teams and earning accolades such as All-Star selections and a World Series championship. He was known for his versatility on the mound and his contributions to charitable causes off the field.