Drug company Medivation Inc. hired Rick Bierly as chief financial officer, replacing Patrick Machado, who is leaving the San Francisco company.<br />Bierly, 58, was an executive director in Ernst & Young's life sciences practice before Medivation hired him. He worked in the past at Johnson & Johnson (NYSE: JNJ).<br />Medivation will pay Bierly a salary of $458,000 and a one-time bonus of $320,000 which he must repay in full or in part if he leaves the company voluntarily within two years.<br />The company will also pay him his moving costs plus tax gross up payments.<br />Machado told Medivation in November that he wanted to retire, but he agreed to stay until a new CFO was found. He's leaving Medivation in April.<br />David Hung, M.D., Medivation's CEO, will be Bierly's boss.<br />The company is working on treatments for prostate cancer and breast cancer, as well as other drugs in early development.