What is john hammergren?

John Hammergren is an American businessman who had a long and successful career in the healthcare industry. He was the chairman and CEO of McKesson Corporation, a Fortune 500 company that provides pharmaceuticals and healthcare products and services. Hammergren joined McKesson in 1996 and held various leadership positions before becoming CEO in 2001. Under his leadership, McKesson grew to become one of the largest healthcare companies in the world. Hammergren retired from McKesson in 2019 after serving as CEO for 18 years. He has been recognized for his leadership and business acumen, receiving multiple awards and accolades throughout his career.