Mike McMullen has been appointed chief executive officer of Agilent Technologies Inc., effective immediately. Mr. McMullen succeeds William (Bill) Sullivan, who becomes a company advisor until he retires on Oct. 31, 2015.   “Bill Sullivan has been an extraordinary CEO over the past decade,” said James G. Cullen, chairman of Agilent’s board of directors. “Under his leadership, the company has been transformed from a diversified technology company to a highly focused leader in life sciences, diagn...