Graeme Devine, who joined Apple's iPhone Game Technologies division last year, tells the "Kotaku" site (http://kotaku.com/5708642/apple-loses-its-iphone-game-guru) that his last day at the company was Friday. He says he left the company to return to game development, concentrating specifically on the iPhone and iPad.

"My job there was basically to make gaming on the iOS devices fantastic," Devine said. "Basically that meant looking at the technologies involved and making sure the software played well with the hardware, to look at upcoming hardware/API and say 'Yup, that is a good thing'."

Devine told "Kotaku" that he can't comment on whether his position will be filled. But he says Apple gamers shouldn't worry.

"Apple has the smartest and most talented group of people I have ever worked with," he told "Kotaku." "Every day I would walk in and feel I was working alongside geniuses and I the guy with crayons in the corner."