Michael J. Holston has been appointed chief ethics and compliance officer at Merck, effective June 25, 2012. Mr. Holston will report to Kenneth C. Frazier, Merck’s chairman and chief executive officer, and will serve on the company’s executive committee. He will be responsible for driving high ethical standards and compliance across the company’s business globally. He succeeds Richard S. Bowles, who has decided to retire after more than 35 years with Merck and the former Schering-Plough. ...