We wanted to reassure you that Arizona Oncology remains open to provide medically necessary, life-sustaining care. In addition, our expert care team can now see patients through scheduled virtual appointments on a secure platform from the comfort and safety of your home.

Updated visitor policy: For the safety of our patients and staff, effective April 3, 2020, no visitors will be permitted into the clinic. Family members and caretakers may participate in the appointments remotely by phone or video conference if desired.

If you have flu-like symptoms, you should contact Arizona Oncology before visiting our clinics for scheduled appointments. This includes fever and symptoms of respiratory illness, such as coughing or difficulty breathing.

We ask that you follow our tips to stay healthy and to help do our part in prevention of spreading of these viruses.

Locations and Physicians

David T. Vonk, MD

Patient Portal


Radiation Oncology


Tucson - St. Mary’s Radiation Oncology
1620 W. St. Mary's Road
Tucson, AZ 85745
Phone: (520) 791-7996
Fax: (520) 791-3329

Tucson - Orange Grove Radiation Oncology
1845 W. Orange Grove, Bldg. 1
Tucson, AZ 85704
Phone: (520) 544-2919
Fax: (520) 544-2943

David T. Vonk, MD


Arizona State University

Medical School

University of Wisconsin School of Medicine and Public Health


Gundersen Lutheran Hospital


University of Arizona

Board Certification

Radiation Oncology


After completing his undergraduate studies in Physics at Arizona State University, Dr. Vonk graduated with honors, with a focus in Medical Physics. He earned his medical degree from the University of Wisconsin School of Medicine and Public Health in Madison. Following graduation from medical school, Dr. Vonk completed a Transitional internship at Gundersen Lutheran Hospital in La Crosse, Wisconsin. He completed residency in Radiation Oncology at the University of Arizona where he served as chief resident.

Dr. Vonk's primary focus is to compassionately deliver evidence based care that is patient centered. He has a particular interest in the implementation of advancing radiation technologies including intensity modulation, stereotactic ablative therapy, and functional imaging for target delineation.

When outside of the clinic, Dr. Vonk spends his time hiking and camping in the beautiful desert and mountains of Tucson with his wife and three young boys.