TJ Fixman, a senior writer at Insomniac Games who has worked on franchises including Ratchet & Clank, Resistance and Overstrike, has announced his departure from the studio.

"After seven years and nine games, I'm leaving Insomniac," he wrote on his personal blog.

"When I came to Insomniac, I was a newbie in Los Angeles who had never worked as an in-house writer before. Insomniac taught me about game writing, voice recording, and the video game pipeline. At the same time, I was writing feature scripts on the side (it's a good way to cleanse the palette when Captain Qwark's voice is stuck in your head)," wrote Fixman.

"Finally, just this past year, I had the privilege of jumping into the feature world with One Night on the Hudson and the Ratchet & Clank movie. Despite the rewrite deadlines, story meetings, and note sessions, I told myself I could manage the workload - all while working on two games in simultaneous production on opposite ends of the country (And you wondered why I had all those energy drinks by my desk!)."

Fixman says that he has taken on a feature assignment at Disney and sold a script to New Line, making his workload simply too great to handle.

"Two projects, two days. And more projects rolling in," wrote Fixman. "Now I'm tallying up hours in the day and figuring out how I'd be able to get my pages done on time, and it became immediately clear it was time to make the leap."

He added: "Other than the aforementioned scheduling gymnastics, my moving on is about searching for a new challenge. I can look at my time at Insomniac and feel like I've done what I set out to do there. As for other mediums, I feel like I'm just getting started. I'm excited by movies and television. I want to get back into graphic novel writing. I want to develop different projects with new characters and stories and worlds I can explore. Right now I have the opportunity to try all of it, and when you're handed a gift like that, you have to grab onto it with both hands."

Fixman's relationship with Insomniac will continue through the development of the in development Ratchet & Clank movie, however.

"As a producer and writer on the movie, I will still be helping to shepherd Ratchet & Clank into the feature world," he explained. "I've also made sure the North Carolina studio has everything they need to finish Ratchet & Clank: Into the Nexus, a truly awesome game I hope you all love. My relationship with Insomniac will continue, as will my involvement with the video game industry. How it will all coalesce is something I'll work out along the way, but I could never abandon the industry that has given me so much."

Ratchet & Clank: Nexus will be released this Christmas for PS3.