Revolution Partners.

Revolution Partners, a Boston-based investment bank, plans to open offices in Los Angeles and San Francisco to provide private placements to middle market technology companies.

The company has hired Josh Tanzer, a 20-year veteran of the industry and a former managing director at Lazard Freres & Co., to head its Los Angeles office. Michael Barker, a former investment banker at Morgan Stanley and at Credit Suisse First Boston, will head the San Francisco office.

"We've always wanted to have a presence on the West Coast," said Peter Falvey, Revolution's co-founder and managing director.

Tanzer raised $175 million in private equity while he was at Lazard for Virgin America, a fledgling airline. He has owned his own technology firm, Principia Capital Group, and was the global head of private equity for CSFB's technology group,

"Because of the convergence of entertainment and technology, it s now reached critical mass," he said.

Revolution Partners, with 17 bankers and 20 employees, has closed 39 deals since it was formed five years ago.