McDonald's announced yesterday that Mike Andres would retire as U.S. president at the end of the year and be replaced by Chris Kempczinski, its current EVP strategy, business development and innovation, on Jan. 1. Kempczinski, 47, will be the fourth head of McDonald's U.S. business since November 2012, reports Ezequiel Minaya in the "Wall Street Journal." He joined McDonald's last October.