Marcus Lehto is the co-creator of the Halo games and, until 2012, was a senior creative on every Halo game made by Bungie. After that he left to set up on his own with the studio V1 Interactive (which made the shooter Disintegration), before joining EA in 2021 and founding Ridgeline Games, a Seattle-based developer that was working on a new Battlefield game with more of a story focus.
I say "was" because unfortunately Ridgeline has become one of the latest victims in a brutal period of game and tech layoffs. At the end of February EA announced that it would be closing the studio, and laying off all of its staff. Around the same time, Lehto announced he would be leaving the publisher. And he's not a happy camper.
