John O. Agwunobi is a Scottish-born Nigerian-American former public health official, pediatrician, and the current chief executive officer and former executive chairman of Herbalife Nutrition. He was formerly senior vice-president of Walmart and president of the retailer's health and wellness business from 2007 to 2014. Agwunobi served as assistant secretary for health for the U.S. Department of Health and Human Services and was Florida's secretary of health and state health officer from 2000 to 2005.