Iowa City Cancer Treatment Center
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About Us


Meet Our Team

Every patient is under the care of a board-certified radiation oncologist who is a cancer specialist with expertise in the application of radiation therapy as it is used in the management of cancer. Our goal is to maximize the chances of curing cancer while minimizing the radiation dose to normal organs, thus attempting to maintain your quality of life and preserve your normal organ function. Our radiation oncologists and staff members are committed to your well being. 

Dr. Watkins
Medical Education: Medical University of South Carolina
Indiana University
Butler University

Dr. Watkins joined the Iowa City Cancer Treatment Center in 2014, after having practiced in North Dakota for 5 years, and South Carolina prior to that time. He completed his specialty (residency) training at the Medical University of South Carolina (Charleston, SC). A native Hoosier, Dr. Watkins attended Indiana University (Indianapolis) for his medical school training, and studied Chemistry and Spanish at Butler University (Indianapolis) during his pre-medical (undergraduate) years. He is fluent in English and Spanish, and has extensive experience treating adult cancers, publishing over 30 original research studies on prostate, lung, head/neck, esophageal, and breast cancers, amongst others.

Behind the scenes

Before radiation treatment can begin, there is a lot of work that is performed behind the scenes. This is the work of the radiation physics team.  This team includes a medical physicist and certified medical dosimetrist.  They work together with your radiation oncologist using special computers and software to determine the best delivery of radiation therapy.  They also perform standard quality checks on a weekly basis during your treatment and are responsible for quality assurance testing on the machine with regular testing that is reported to the State of Iowa as required by law.  

Joseph M. Modrick, Ph.D.
Medical Physicist

Bachelor of Science
Physics and Mathematics
University of Northern Iowa
Cedar Falls, IA

Master of Science
Theoretical High Energy Physics
University of Iowa
Iowa City, IA

Master of Science (1998)
Doctor of Philosophy
Medical Physics
University of Wisconsin-Madison
Madison, WI


Research Clinical Physicist
Radiation Oncology
University of Michigan
Hospitals and Clinics
Ann Arbor, MI

Clinical Assistant Professor
Radiation Oncology
University of Iowa
Hospitals and Clinics
Iowa City, IA
2002 - present


American Board of Radiology
Therapeutic Medical Physics

Iowa Department of Public Health
Radiation Therapy (Certificate #47)
Medical Physicist

Timothy J. Waldron, M.S.
Medical Physicist

Bachelor of Science
Richard Stockton State College, 1985

Master of Science
University of Texas Health Science Center
MD Anderson Cancer Center, 1995

Clinical Training: MD Anderson Cancer Center
Clinical Experience:

Savannah Cancer Treatment Center, Savannah GA, 1986 - 1995
Fox Chase Cancer Center Philadelphia PA, 1986 - 1995
MD Anderson Cancer Center, Houston TX 1998 - 2004
University of Iowa Hospital & Clinics, Iowa City, IA 2004-

Licensed: Texas Board of Licensure for Professional Medical Physicists, 1995-
Certification: American Board of Radiology, 2000
Therapeutic Radiological Physics
  Therapeutic Radiological Physics
Adam Dalhart, MS
Medical Physicist

BS, Radiological Health Science, Purdue University
MS, Medical Physics, University of Toledo

Chief Resident, Medical Physics, University of Iowa

Licensure and Certifications Radiation Therapy Physicist - Iowa Department of Public Health
  Therapeutic Radiological Physics
Wendy Jones, MHP, CMD, BS, RTT
Certified Medical Dosimetrist

Certificate in Radiologic Technology, 1999
Iowa Methodist Medical Center
Des Moines, IA


Bachelor of Science
Radiation Sciences, 2001
University of Iowa, College of Medicine
Iowa City, IA

Master of Health Physics: Radiation Health Physics, 2010
Oregon State University
Corvalis, OR


Medical Dosimetry, MDCB, 2011

Radiation treatment delivery

Radiation therapists are specially trained and certified in the delivery of radiation therapy.  They work under the direct supervision of the radiation oncologist to administer daily radiation treatments.  They are responsible for daily patient positioning for therapy, delivery of treatment, and maintenance of daily records.  Additionally, they perform routine checks on the treatment machine to verify proper and accurate treatment conditions.

Cheryl Geistkemper, R.T.(R)(T)
Chief Radiation Therapist

Certificate in Radiologic Technology, 1992

Mercy/ St. Luke’s School of Radiologic Technology


Certificate in Radiation Therapy, 1993

University of Wisconsin Hospital, Madison, WI
Andrea Zais, BS, RTT
Staff Radiation Therapist

Bachelor of Science, 2011
Major: Radiation Therapy
Minor: Biology

University of Wisconsin-La Crosse
La Crosse, WI

Anne Hatcher, BS, R.T.(R)(T)
Staff Radiation Therapist

Bachelor of Science, 2014
Major: Radiation Sciences

Certificate in Radiation Therapy, 2014

Certificate in Radiologic Technology, 2013
University of Iowa

Iowa City, IA


Support staff

Our staff also includes a medical assistant, support services specialist and a health care services manager.  They ensure that the entire team has the information and resources needed to offer our patients the best quality care available.

Nancy Hoffman 
Nancy Hoffman MBA, MHSA, RTT
Health Care Services Manager
Training: Associates of Science, Radiologic Technology, 1985

Sauk Valley College, Dixon, IL


Certificate in Radiation Therapy, 1986


St. Joseph’s Hospital, Milwaukee, WI

 Education: Bachelor of Science, Health Arts 1992
  College of St. Francis, Joliet, IL
  Masters in Health Services Administration, 1995
  College of St. Francis, Joliet, IL

Masters in Business Administration, 2014 Tippie School of Business University of Iowa Iowa City, IA
Brandy Schmidt 
Brandy Schmidt, LPN
Medical Assistant
 Education: Licensed Practical Nurse Kirkwood Community College, 2004
Kelly Drake 
Kelly Drake, BBA
Support Services Specialist
 Education: Bachelor of Business Administration, 1983 University of Iowa Iowa City, IA


Iowa City Cancer Treatment Center
3010 Northgate Drive, Iowa City, IA 52245
Phone: 319-354-8777
Fax: 319-354-9545
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