Call of Duty: Ghosts' executive producer Mark Rubin has left Infinity Ward following a 10-year stint at the studio, Activision has confirmed.
Rubin joined Infinity Ward in 2005 shortly before the launch of Call of Duty 2, although the reason for his departure has yet to be made clear. Besides Call of Duty: Ghosts, Rubin also acted as executive producer on 2011's Call of Duty: Modern Warfare 3.
Todd Alderman, meanwhile, who served as lead designer on Call of Duty: Modern Warfare 2, has returned to the studio as multiplayer project director five years after his exit from the company.
Alderman left Infinity Ward during the studio's mass exodus in early 2010, joining former colleagues at Titanfall studio Respawn Entertainment. He later left Respawn to join Riot Games.
He was also named as one of 38 Infinity Ward employees who sued Activision for unpaid bonuses on Modern Warfare 2.
"The chance to come back to Infinity Ward and Call of Duty is something I didn't think would ever happen," Alderman said in a statement provided to Polygon. "It's been five years since I've been here and a lot has changed. There are a lot of new faces and motivated people who want to make something great. It's a really cool game concept that I want to be a part of. I can't wait to see what we do with a three-year dev cycle. I'm excited to be back."
Infinity Ward merged with Tony Hawk Pro Skater creators Neversoft last summer to form a new "super-studio". The studio is expected to be developing a new Call of Duty title set for release in 2016.
This year's Call of Duty game, which has yet to be named, is currently in development at Call of Duty: Black Ops 2 studio Treyarch.