After leading the Phillies to their first playoff series win since 2010, Thomson was named the full-time manager on October 10, 2022.

[3][2] Thomson led the Jayhawks in hits in 1984 and 1985 and holds the school record for the highest single-season batting average.

[2] Thomson was selected by the Detroit Tigers in the 32nd round of the 1985 Major League Baseball draft from the University of Kansas.

[1] Thomson represented Canada in baseball, which was a demonstration sport, in the 1984 Summer Olympics in Los Angeles.

[5] On April 4, 2008, Girardi became ill due to a respiratory infection and designated Thomson to manage that night's game against the Tampa Bay Rays.

Joe Torre, the Yankees' manager at the time, nicknamed Thomson "Topper", because he "was always on top of everything" while running the camp.

Thomson was initially a candidate to fill the role, but the team ultimately hired Aaron Boone as manager instead.

[13] On December 5, 2017, after 28 seasons with the organization, Thomson departed the Yankees and was hired as the bench coach for the Philadelphia Phillies, joining the staff under first-year manager Gabe Kapler.

Thomson became the fourth interim manager in MLB history to take over a team at least seven games under .500 and lead them to the postseason.

Following the Wild Card Series win, the Phillies removed Thomson's interim tag and officially named him the 55th manager in franchise history, with a two-year contract.

[19] In the NLCS, the Phillies defeated the San Diego Padres in five games to win their first league pennant since 2009.

Thomson became the first manager to lead their team to the World Series after taking over during the season since Jack McKeon with the Florida Marlins in 2003.

Thomson received criticism for his managerial decisions in Game 6 of the series, as in the sixth inning, with the Phillies leading 1–0, Thomson pulled starting pitcher Zack Wheeler after 70 pitches and replaced him with reliever José Alvarado, who would go on to give up a go-ahead home run to Yordan Alvarez.

After another slow start to the season, Thomson led the Phillies to a 90–72 record and a second-straight wild card berth.

For the second-straight year, the Phillies upset the Braves in four games, advancing to the National League Championship Series.