HMC Clinic at Harrisburg and Marion : Harrisburg Medical . Health Details: Proven Health Care For Southeastern Illinois Patients. HMC Clinic at Harrisburg and HMC Clinic at Marion was established in 2003 when James O. Alexander, MD, obtained the practice from a retiring Dr. Schaede. Dr. Alexander had returned to Harrisburg to practice in 1991 and went on his own in 1997. hmc outpatient ....