His areas of expertise include the following: neurosurgery, spasticity, and hydrocephalus. He is in-network for Medicare insurance. Dr. Mercier attended medical school at the University of Saskatchewan College of Medicine. Dr. Mercier trained at a hospital affiliated with the University of Calgary for his residency. He is professionally affiliated with SSM Health St. Mary's Hospital - St. Louis and SSM Health Cardinal Glennon Children's Hospital.