John Hammergren is the Chief Executive Officer of McKesson, one of the world's largest healthcare services and technology companies. He has been with the company since 2001, and has been instrumental in McKesson's growth and success. Under his leadership, McKesson has become a leader in the
From Wikipedia
John H. Hammergren is an American businessman. He is best known for his role as chairman and CEO of McKesson Corporation since 1999. On November 1, 2018, Hammergren announced his plan to retire. On April 1, 2019, he officially retired from McKesson. He was succeeded by Brian Tyler.