Memorial Hermann Health System has named Dr. Benjamin Chu as its new president and CEO, replacing Dan Wolterman, who announced his retirement in October and has served as CEO since 2002. Chu currently serves as the executive vice president of Oakland, California-based Kaiser Foundation Hospitals and Health Plan Inc. and group president for Kaiser Permanente Southern California and Georgia. He manages the health plan and hospital operations for 14 hospitals and 237 medical offices which services more than 4.5 million members, according to a statement.