Jason Christiansen is a former Major League Baseball pitcher who played for several teams during his career. He was born on September 21, 1969, in Omaha, Nebraska, and attended high school in Council Bluffs, Iowa. Christiansen played college baseball at the University of Nebraska and was drafted by the Pittsburgh Pirates in the 43rd round of the 1991 MLB draft.

Christiansen made his MLB debut with the Pirates in 1995 and spent four seasons with the team. He was primarily used as a relief pitcher and had a career-high 3.24 ERA in 1998. In 1999, Christiansen was traded to the St. Louis Cardinals, where he spent two seasons. He had a 2.35 ERA in 2000, which was the lowest of his career.

After his time with the Cardinals, Christiansen played for the Anaheim Angels, San Francisco Giants, and Milwaukee Brewers. He had a career-high 4.31 ERA with the Angels in 2002 but rebounded with a 2.63 ERA with the Giants in 2003. Christiansen's final season in the MLB was with the Brewers in 2005, where he had a 4.50 ERA in 18 innings pitched.

Throughout his career, Christiansen was known for his ability to get left-handed batters out. He held lefties to a .218 batting average and had a 3.45 ERA against them. Christiansen was also a reliable reliever, appearing in over 50 games in six different seasons.

After retiring from baseball, Christiansen became a high school baseball coach in his hometown of Council Bluffs, Iowa. He also worked as a color commentator for the Omaha Storm Chasers, the Triple-A affiliate of the Kansas City Royals.

In conclusion, Jason Christiansen had a successful career as a relief pitcher in the MLB. He played for several teams and was known for his ability to get left-handed batters out. Christiansen retired from baseball and became a coach and commentator.