ZenithOptimedia named Brian Berg as senior vice president, director of human resources. Prior to joining the agency, Berg served as vice president of talent and organizational design at Macy's.

Yahav Isak joined Digitas Health as senior vice president, project management. Before joining Digitas Health, Isak served as senior vice president, operations and delivery at MRM Worldwide.

Brainshark elevated Andy Zimmerman to chief marketing officer.

Mintz & Hoke has hired Stephanie Flynn Clason as business development coordinator.

Mike Buchner, COO of Fallon, has been appointed CEO. He succeeds Chris Foster who moves within Publicis Groupe as chairman and regional CEO of Saatchi & Saatchi Asia Pacific.

Arnold Worldwide hired Elliott Seaborn as executive vice president, executive director. Most recently, Seaborn was senior vice president at Digitas.

Pierre Odendaal joined Razorfish as group creative director in the New York office.

ROKKAN hired Lucas Hearl and Quintin Lodge as art directors. Hearl joins from RGA where he worked on the Nike account and Lodge joins from Huge where he worked on the Adult Swim application.

Martha Stewart Living Omnimedia hired Lisa Gersh as president and chief operating officer. Gersh was a co-founder of Oxygen Media and served as its president and chief operating officer from 1998 until 2007 when NBC Universal acquired Oxygen.

Publicis Modem San Francisco hired Alex Lyman as vice president & creative director on the global LG Mobile account.