Neil Young and Bob Stevenson, two founders of Ngmoco, have announced they are leaving the iOS-focused game studio. It was acquired by Japanese publisher DeNA in 2010 for more than $400 million, as part of a push into the US market.

Vice president of studios Clive Downie will take over as chief executive and head up all western operations of DeNA's mobile social platform, reports VentureBeat. Young plans to stay on the DeNA board. Fellow founders Alan Yu and Joe Keene are still with the company.

"We couldn’t be happier that Clive, our long time colleague and friend is taking the reins of the Western business by becoming the new CEO," Young said. "Our confidence in Clive and the momentum of DeNA’s business in the West makes this the right moment for us to move on to our next adventure."

Ngmoco is best known for its iOS games Rolando and Rolando 2.