William Herkewitz is Healthbeat's global public health writer. A journalist and former American diplomat based in Nairobi, Kenya, he has over a decade of experience in science, health, and policy reporting for publications including The New York Times, Scientific American, and Popular Mechanics. From 2016 to 2025, he also served as the head of communications at the U.S. Agency for International Development’s country offices in Rwanda, Ethiopia, and Kenya.