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Brian Purchia has left his post as Deputy Communications Director and Tech Advisor for San Francisco Mayor Gavin Newsom to join Burson Marsteller’s digital arm, Proof Integrated Communications.

Newsom’s former communications director, Nathan Ballard, joined Burson to run their San Francisco office just a few weeks ago.

“Brian’s done genuinely innovative work and helped open up San Francisco government,” Craigslist founder Craig Newmark told the San Francisco Chronicle today.

In addition, Michael Beno has also joined Proof as a director. He was most recently with Ruder Finn. Proof hired B.L. Ochman as its managing director in January.

For those keeping score at home, so far this year B-M has hired a new digital employee once every ten days.