Mark Gregory Collins, age 60, of Rochester Hills, passed away on March 14, 2021. With his wife of 28 years Mark raised 4 beautiful children. He had a wide range of hobbies including backpacking, shooting, vegetable gardening, bread making, birding, reading, and most recently sailing. Mark practiced Anesthesiology for 27 years, the last 20 with a wonderful group of physicians and nurses at McLaren Macomb Hospital. His retirement plans included volunteering, travel, and spending time with friends and family. He is the loving husband of Nancy Collins, dear father of William (Brandie) Nichols, Thomas Nichols, Emily (Chancelor) Hayes and Mitchell Collins, cherished grandfather of Riley, Cameron and Addison. Brother of Joe Collins, Sue (Bob) Kania, George Collins, John (Tracey) Collins and the late Maryann Collins.