Terry Gregson is retiring as the NHL's head of officiating.
Stephen Walkom will leave his job as an on-ice referee to take over as senior vice president and director of officiating, the league announced Wednesday.
It's a familiar role for Walkom, who held the position from 2005-09.
Gregson, who joined the front office in 2005 after a 25-year career as a referee, will serve as a consultant to the NHL on officiating matters, including the league's participation in the 2014 Olympics.
"Terry had the unique ability to expertly manage the 78-man NHL officiating team," NHL senior vice president Colin Campbell said in a statement. "His tireless efforts behind the scenes to ensure that NHL officiating was the best it could be on a nightly basis were seldom recognized publicly, but we greatly appreciate his dedication to the game both on and off the ice for the past 33 years."