861 Health Park Blvd. Grand Blanc MI 48439       
                                Phone: 810- 953-0500
                                 Fax: 810-953-0031
Meet our Surgeons  
ALL OF OUR DOCTORS ARE BOARD CERTIFIED!
Dr. Tien M.D. grew up in East Lansing and attended the University of Michigan Medical School. In addition to his work at Greater Michigan Orthopedics, he also maintains a practice in Jackson, Michigan. He is a board-certified orthopedic surgeon specializing in reconstructive surgery of the foot and ankle. He did his orthopedic residency at the United States Naval Hospital in Bethesda, Maryland, and a foot and ankle fellowship at Union Memorial Hospital in Baltimore, Maryland. Following his service in the Navy, Dr. Tien returned to Michigan, and resides in the Ann Arbor area with his wife Suzanne and their three children.

Dr. Heming D.O. completed an Internship at Genesys Regional Medical Center. He served in the Navy for four years, and was the Medical Director for Sports Medicine and Rehabilitative Therapy at the Great Lakes Naval Base. He returned to Genesys to complete a Residency in Orthopedics, followed by a Sports Medicine Fellowship at Harvard. While at Harvard, he worked with the Boston Celtics and Harvard athletic teams. He is a Clinical Instructor at Genesys for Michigan State University of Osteopathic Medicine, and Kirksville College of Osteopathic Medicine. Dr. Heming has published various professional articles, and presented Sports Medicine lectures on a national level. He resides in the Clarkston area with his wife Dana and their four children.
Dr. Marquart did his fellowship at Michigan Foot and Ankle International in Pontiac, Michigan. His orthopedic surgery residency was completed at Genesys Regional Medical Center in Grand Blanc, Michigan where he was chief resident. He earned his Doctor of Osteopathic Medicine at Western University of Health Sciences College of Osteopathic Medicine of the Pacific in Pomona, California. He obtained his bachelor's degree from Concordia University in Irvine, California where he was an NAIA All-American scholar athlete in baseball. 
He specializes and is well trained in advanced reconstruction of the foot and ankle and in all aspects of general orthopedics. He resides in Linden with his wife Christie 
and their children. 
Dr. Sandrock D.O. graduated from the University of Osteopathic Medicine and Health Sciences in Des Moines, Iowa. After serving four years with the United States Air Force, he completed his Orthopedic Surgery Residency at Flint Osteopathic Hospital. He is a Board Certified Orthopedic Surgeon and serves as a Clinical Assistant Professor at Genesys Regional Medical Center for the Michigan State University College of Osteopathic Medicine. Dr. Sandrock practices General Orthopedics including joint replacement, Sports medicine and Fracture care. He lives in Grand Blanc with his wife Sandy where they raised their four children.
Dr. Fallahi M.D. completed his undergraduate work at the University of Michigan – Ann Arbor and received his Doctor of Medicine degree with honors from Wayne State University. He is Board Certified in Orthopedic Surgery and fellowship-trained, receiving additional training and experience at Rush University Medical Center in Chicago, IL, and the Christine M. Kleinert Institute for Hand and Microsurgery in conjunction with the University of Louisville. Dr. Fallahi specializes in microsurgery procedures involving the elbow, wrist, and hand. A Michigan native, Dr. Fallahi, his wife Dania, and their two daughters reside in Franklin, MI.
Dr. Ryan Nelson D.O. is a Flushing native. He graduated from the University of Michigan, the Midwestern University in Chicago, IL, and did his Residency at Genesys. Dr. Nelson completed a fellowship at New England Baptist Hospital, and received additional training at Boston Children’s Hospital. He served as the team doctor for the Boston Celtics, and was on the clinical faculty for the Tufts University Medical School. Dr. Nelson specializes in complex sports injuries, cartilage restoration, alternatives to joint replacement, hip, knee, and shoulder surgery. He is active in outcomes driven research, passionate about orthopedics and patient care, and enjoys serving the community where he was raised.
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