Jason Gilbert Giambi is an American former professional baseball first baseman and designated hitter.
In his Major League Baseball career, which began in 1995, he played for the Oakland Athletics, New York Yankees, Colorado Rockies and Cleveland Indians.
Giambi was the American League MVP in 2000 while with the Athletics, and is a five-time All-Star who led the American League in walks four times, in on-base percentage three times, and in doubles and in slugging percentage once each, and won the Silver Slugger award twice.
He took performance-enhancing drugs during his career, for which use he publicly apologized.
Giambi was named one of the Top 10 Most Superstitious Athletes by Men's Fitness.