Eric Cosper, formerly of Fallon/New York, and Simeon Roane from 180/Amsterdam have joined Publicis/Seattle as associate creative directors. Cosper, who is an art director, and Roane, a copywriter, will work together as a creative team on the T-Mobile account. ... Michael Waldron and Erik van der Wilden, both formerly of The Diecks Group, have officially announced the launch of NailGun, a new New York-based motion graphics company, which recently completed a promo project for Nickelodeon. ... New York production company Zero 2 Sixty and Atlanta's Comotion Films have entered into a joint marketing and production alliance. Director Mark Claywell, formerly of Highway 61, has signed with the partnership for exclusive commercials representation.