Gamasutra reports Lemarchand is leaving Naughty Dog for the Interactive Media Division of the School of Cinematic Arts at the University of Southern California.
"I've always loved the experimental and avant-garde," he told the site. "I wanted to try to make a game in that sphere for the best part of a decade now."
Lemarchand had been with Naughty Dog since Jak X in 2004, and was previously a designer alongside Uncharted head writer Amy Hennig at Crystal Dynamics. Hennig also wrote the Soul Reaver arc of the (incredible) Legacy of Kain series, which Lemarchand was a designer on.