Gregory Allan Gibson is an American former Major League Baseball umpire who worked in the National League from 1997 to 1999 and throughout both major leagues from 2000 to 2022. He was promoted to crew chief for the 2022 season.

The 2001 American League Division Series (ALDS), the opening round of the 2001 American League playoffs, began on Tuesday, October 9, and ended on Monday, October 15, with the champions of the three AL divisions—along with a "wild card" team—participating in two best-of-five series. The teams were:(1) Seattle Mariners vs. (3) Cleveland Indians : Mariners win series, 3–2. (2) New York Yankees vs. (4) Oakland Athletics : Yankees win series, 3–2.