Jagex CEO and CTO Mark Gerhard is leaving the RuneScape developer at the end of the year.
He will work at the Cambridge-based studio until the end of the year to help with the transition, with a replacement CEO to be announced "in the near future".
Gerhard has been CTO for Jagex since he joined in 2008, adding CEO to his role a year later. He has assisted the studio expand its portfolio as well as enhance its flagship title RuneScape.
"It has been an amazing seven years and I am proud to be a part of the great company Jagex is today," he said. "It is never easy to say goodbye, but I believe I am leaving the company well positioned for the future, in good hands and with a deep bench of talented people as I move on to new challenges."
Jagex shareholder and board member Jeff Horing added: "It's been a pleasure to work with Mark and see first-hand his commitment to Jagex. He has been a guiding hand through a changing landscape and helped take the company to the next level. We wish him every success in his future endeavours."