Comedy director Maggie Zackheim, formerly with HKM, has signed with bicoastal production company Headquarters. ... RubberBand Music
, a company devoted to representing musical artists and film and TV composers for commericals, launched last week in Santa Monica. RubberBand -- a collective anchored by Immortal Records founder Happy Walters, Nicole Dionne of music house Primal Scream, KCRW host Greg DaPonte and Comedy Central's Andy Zax -- will provide music composition, supervision and licensing services through Primal Scream. ... Gregg Dallesandro, formerly a rep at Coma, has joined the commercial and music video department of the Lyons Sheldon Prosnit Agency in Los Angeles. ... Sternworld Creative Management has launched in Venice, Calif., under the direction of Andrea Stern, former president and founder of Lab903. Sternworld represents a roster of design, branding and promo houses that includes Big Fish Marketing, Engine Room, Jacobsrahi, The Thomas Cobb Group and TwinArt.