Our Dedicated Physicians

Dr. Mark Bettag

Dr. Mark Bettag

Dr. Mark Bettag is board-certified in Hematology/Medical Oncology, Internal Medicine, Hospice, and Palliative Care Medicine. He began practicing in Sheboygan County in 1995. In 2004, Dr. Bettag opened Sheboygan Cancer & Blood Specialists. Patients appreciate his dedication, expertise, and deep concern for their special needs.

Dr. Bettag completed an Internal Medicine residency at Loyola University Medical Center in Maywood, Illinois, and a Hematology/Oncology fellowship at the University of Colorado Health Sciences Center in Denver. 

Dr. Bettag is a member of both the American Association of Cancer Research and the American College of Physicians. 

Dr. Marshall Matthews

Dr. Marshall Matthews

Dr. Matthews is board-certified in Medical Oncology, Internal Medicine, Hospice, and Palliative Care Medicine. He has practiced in Sheboygan since 1992. Patients and their families have known him to provide the perfect mix of expertise, commitment, and compassion. Dr. Matthews completed an internship, residency, and fellowship in Hematology/Oncology at the University of Wisconsin Hospitals and Clinics in Madison, Wisconsin.

Dr. Matthews is part of the Board of Directors for Physicians' Health Network as well as a member of the American Society of Clinical Oncology, Wisconsin Association of Hematology and Oncology, American Academy of Hospice and Palliative Medicine, and the American College of Physicians.