Carat hired former Avenue A | Razorfish ACD Ross Stewart as group creative director. ... Boston-based entertainment/lifestyle agency Viewpoint Creative added executive producer Diana De Vries to its Los Angeles office. ... Laura Lang will succeed David Kenny as CEO of Publicis-owned interactive agency Digitas as Kenney takes over the new Publicis unit VivaKi as a managing partner. ... Executive producer Oliver Fuselier and director Lance Kelleher joined Santa Monica, CA production company Incubator. ... After a three-year stint at Glassworks, colorist Tareq Kubaisi has rejoined VFX house Prime Focus, London as CEO of telecine. ... West coast production company Kaboom announced the addition of head of production Steven Sills. ... New York studio Pulse Music added producer Kay Gee, co-founder of hip-hop group Naughty by Nature, to its team.