David Fenton has sold Fenton Communications, a leading progressive PR firm, after a 33-year run.

david fentonJames Marcus, ex-investment banker and head of Fenton Studios, and Craig Leach, founder of Collegium, and CEO of Graham-Pelton Consulting CEO, are new owners.

Bill Werde, editorial director and eight-year veteran of Billboard, takes the CEO slot.

He expanded the music trade magazine Billboard into the digital/social/TV/video/events platforms and wrote for the New York Times, Rolling Stone and Wired.

Fenton, 62, will continue at the firm as founder and chairman.

He views Marcus, Leach and Werde as "the next guardians of our public-interest mission and values."

Fenton will focus his energy on climate change, which he considers the No. 1 communications challenge.

The firm has more than 60 staffers in Washington, New York, Los Angeles and San Francisco.

It is joining the Collegium network of communications firms offering services to foundations, non-profits and corporate social responsibility/sustainability programs.