Was Steve Kenson involved in the design of Mutants & Masterminds 3e?

I was talking to a group of gaming friends and the topic of Green Ronin and Steve Kenson came up. Someone commented that Steve Kenson was working on Aberrant and didn’t seem to do anything for Green Ronin anymore. I commented that it seemed he’d branched off into Icons years before that, and that I wasn’t certain whether he’d even worked on the third edition of Mutants and Masterminds. He of course wrote the first and second editions, and he’s credited for “writing and design” in the 3e Heroes Handbook, but I remember he more or less dropped off the Atomic Think Tank at the time, and we had a new line designer shortly after the edition’s release. Since a lot of the 3e text was slightly changed text from 2e, it struck me that they might be crediting his previous work on the system and/or making use of his name to add legitimacy to the new edition.

So, was Steve Kenson substantially involved in the development of Third Edition?