Euro RSCG, Chicago hired former Avenue A | Razorfish, Chicago group creative director Martyn Dean as its GCD for the Citigroup and Kraft accounts. ... Ex-R/GA, New York creative director Natalie Lam joined OgilvyOne, Asia-Pacific as regional CD. Lam will be based in the agency's Beijing office. ... Critical Mass, Chicago announced a handful of new hires including Digitas alum Jon Andexler as creative director, Vanessa Donley as art director and Wunderman alum Rina Mallick as ACD. ... Former Publicis, Seattle ECD Rob Rich joined Hill Holliday as group creative director for the agency's Boston office. ... DDB, New York ECD Joe Cianciotto was promoted to the newly created post of chief community officer. ... Chicago-based, healthcare-focused agency AbelsonTaylor promoted Rose-Marie Cassey to senior copywriter while hiring John Hasbrouck as senior art producer and Shari Neal as associate interactive developer. ... Former Partizan director David Gaddie joined production company The Sweet Shop for global representation. ... New York-based studio Thornberg & Forester hired director, designer and VFX supervisor Jeremiah "Miah" Morehead. ... Richie Grantham joined New York digital agency Sarkissian Mason as VP, strategy + invention. ... MindShare, Australia CEO Chris Walton left after 12 years at the agency. ... Taxi promoted president Rob Guenette to CEO and CFO Ron Wilson as COO.