Crawford Post Production signed creative editor Michael Matassa for representation. ... Mad River Post promoted assistant editor Will Znidaric to editor. ... Wilfrid Park added directors Michael Chaves and Eli Sverdlov to their roster, for Canadian representation. ... London's Absolute Post opened a satellite office based in New York's Chelsea district, to be manned by the cmopany's existing VFX team. ... Kirshenbaum Bond + Partners announced creative director Joseph Mazzaferro has been named partner. ... GJP Advertising named five new partners: Kevin Pfuhl as managing partner, client development, John Yorke as managing partner, business development, Lisa Greenberg, as partner, creative director, Nancy Christou as partner, chief financial officer, and Gord Cathmoir as partner, creative services. ... Venables Bell & Partners hired copywriters Paul Johnson, formerly of Crispin, Porter & Bogusky, and Crockett Jeffers, formerly of Chiat Day/San Francisco, as well as art directors Keith Scott, also formerly of Crispin, Porter & Bogusky, and Tom Scharpf, formerly of Fallon.Minneapolis. ... Steve O'Leary, formerly of CLM BBDO Paris, joined Publicis Conseil as international creative director. ... Leighton Greer, formerly of Zoic Studios, was named head of production for SWAY Studio.