TORONTO - 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 same position from 2005 to 2009.
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.
Gregson worked 1,427 regular-season games and 158 playoff games, including appearances in eight Stanley Cup finals.
"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."
Walkom, a native of North Bay, Ont., refereed 965 regular-season games and 139 playoff games. He also worked the 2002 Olympics and the 2004 World Cup of Hockey as well as four Cup finals.
"We are fortunate to have someone with Stephen's on- and off-ice experience ready to step in to this position," said Campbell.