The search to find a successor to Ralph Baxter is officially on.

In fact, a year and a half after the longtime chairman and CEO of Orrick, Herrington & Sutcliffe announced plans to retire at the end of 2013, the field of candidates to ascend to the firm’s top leadership post has been narrowed to four Orrick partners: Los Angeles-based finance partner Alan Benjamin; Walter Brown, a white-collar litigator in San Francisco; James Stengel, a mass torts and product liability litigator in New York; and Mitchell Zuklie, a technology-focused corporate lawyer in Silicon Valley. The names were provided by a current Orrick partner and former partners still in close contact with colleagues at the firm, speaking on condition of anonymity.