Max Levchin on Yahoo CEO Marissa Mayer: 'Hardest working CEO in Silicon Valley bar none'

There's a lot of hard-working CEOs in Silicon Valley, but former Yahoo director Max Levchin believes no one tops Yahoo boss Marissa Mayer.

Despite recently giving up his seat on Yahoo's board, Levchin reiterated his support for Mayer during an interview with Bloomberg West's Emily Chang on Wednesday, noting that his confidence in the embattled CEO remains "certainly high."

"She is the hardest working CEO in Silicon Valley, bar none," Levchin said. "I think she deserves a tremendous amount of credit for that."

Levchin's defense of Mayer comes against a growing chorus of detractors, who fault Mayer for failing to revitalize Yahoo's business in her more than three years at the helm. Just yesterday, activist shareholder Starboard sent a letter to Yahoo's board, urging a management change.

Without getting into the specifics, Levchin pointed out that Mayer's hard work is most reflected in Yahoo's "genuine successes," from product development and the shift to mobile, and some of the new revenue streams created under her watch.

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