Margaret "Denny" DeNarvaez has been named president/CEO of Wellmont Health System, effective Aug. 1. She succeeds interim CEO Bob Burgin. She was the unanimous selection of the Wellmont board of directors following a national search process. DeNarvaez, 54, has more than 27 years experience in healthcare leadership. She presently serves as CEO of St. John's Mercy Health Care, which includes hospitals in both St. Louis and Washington, MO.