What fortune 500, Michigan based company was the now chairman of Hologic once Chief Executive Officer of?
Stephen P. MacMillan: Stephen P. MacMillan is the Chairman, President, and Chief Executive Officer, and Director of Hologic, a medical device and diagnostic manufacturer headquartered in Marlborough, Massachusetts. Stephen P. MacMillan:  He was previously the Chairman of the Board, President, and Chief Executive Officer of Stryker Corporation, a global medical device company, and has 24 years of healthcare industry operating experience. Stephen P. MacMillan:  He served as Chief Executive Officer of Stryker from January 2005 to February 2012 and served as its President from June 2003 to February 2012. Stephen P. MacMillan:  During his tenure at Stryker, MacMillan successfully led the company through a series of key strategic acquisitions, the launch of a number of products within the orthopedic implants and medical instrumentation businesses, and delivered strong operating performance, with revenue growing from $2.8 billion to $8.3 billion, between 2003 and 2011. Stephen P. MacMillan:  During his tenure, Stryker delivered stock price appreciation of more than 62%, compared to appreciation of the S&P 500 index of approximately 40%. Stephen P. MacMillan:  While MacMillan presided as CEO, Stryker was selected by FORTUNE, over multiple consecutive years, as one of the "World's Most Admired Companies" in the Medical Equipment Industry. Stryker Corporation: Stryker Corporation () is a Fortune 500 medical technologies firm based in Kalamazoo, Michigan. Stryker Corporation:  Stryker's products include implants used in joint replacement and trauma surgeries; surgical equipment and surgical navigation systems; endoscopic and communications systems; patient handling and emergency medical equipment; neurosurgical, neurovascular and spinal devices; as well as other medical device products used in a variety of medical specialties.
Stryker Corporation