Costa Mesa-based Pacific Mercantile Bancorp has named John Clark, a partner at private equity firm Westar Capital LLC, to its board of directors.

Clark also has been appointed a director of the company’s Pacific Mercantile Bank subsidiary.

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Clark has served as a partner at the Costa Mesa private equity firm since 1995.

Westar’s founding partner, George Argyros of real estate investor Arnel & Affiliates, also is a director of Pacific Mercantile.

Clark held management positions at manufacturing companies prior to joining Westar. He also worked as a certified public account earlier in his career.

Pacific Mercantile is among the largest banks based in Orange County, with assets of about $1 billion.