Spectrum Health Medical Group


Health Care / Physicians

About Us

Northwest Personal Healthcare is a three physician practice. We have two family practice physicians, Dr. Timothy G. O'Callaghan and Dr. Amanda Overmyer. In addition, we have Dr. Mary O'Callaghan who specializes in Internal Medicine. Dr's O'Callaghan have been practicing in Mason County since 1989. In September of 2010, Dr. Overmyer joined the practice.


  • Internal Medicine
  • Family Practice