Terry Gregson has taken over as the new head of the NHL's officials. The longtime former referee was promoted to senior vice president and director of officiating, replacing Stephen Walkom, who left the post to return as a referee. "Terry Gregson was an excellent on-ice referee, has worked with Stephen Walkom for the past four years, and is very familiar with the standard of officiating that has proved so successful," Colin Campbell, the NHL director of hockey operations, told the Associated Press. "We are looking forward to a seamless transition."