HSI Productions and videogame shop Immaterial have announced the launch of Medium, a joint-venture aimed at developing branding and sponsorship opportunities in the arena of interactive entertainment. The Medium team will be made up of director Marco Brambilla (Demolition Man, Excess Baggage) -- who will serve as creative director -- writer/art director Robert Auten, and executive producers Rebecca Skinner and Kerstin Emhoff, both of HSI. ... Filmmaker Jared Hess, director and co-writer of the forthcoming comedy Napoleon Dynamite, has signed with Moxie Pictures for commercials representation. ... Tom Cotton, president of DDB Integrated Solutions Group North America, has been named president of Santa Monica-based entertainment marketing agency The Aspect Group. ... Directors Michael Cerny and Allen Martinez have signed with BeachHouse Films for commercials representation. Cerny arrives from Mirella Films, while Martinez was previously with production company Scream.