Merck has made several senior management changes. Richard T. Clark, currently chairman, chief executive officer and president, will continue leading the company. Kenneth C. Frazier, currently president of the company’s Global Human Health worldwide sales and marketing division, was elected company president, reporting to Mr. Clark. Also, Adam H. Schechter, who currently leads the company’s pharmaceutical business in the U.S., was elected to succeed Mr. Frazier as president of Global ...