Meet Our Providers


William Rees II, MD, Clinic Director 

Dr. William Rees grew up in Kansas City, on the Kansas side of the state line.  Dr. Rees attended the University of Kansas where he earned a bachelor’s degree in psychology.  Immediately after graduation, Dr. Rees began working for his father, who owned a commercial custom woodworking plant that manufactured custom wood moldings, cabinets, doors, etc. for commercial buildings, hospitals and schools.

After a few years of working with his father, Dr. Rees realized he wanted to take his professional career in different direction.  Dr. Rees was looking for more purpose and meaning in his career and at age 37, he enrolled in medical school at the University of Missouri and Kansas City medical school.  Dr. Rees graduated medical school four years later and then began his internal medicine residency program at the Mayo Clinic in Scottsdale, AZ.  Dr. Rees finished his residency program at the University of Missouri at Kansas City medical school and after completing his residency program, he then joined the staff at the University as an assistant professor where he taught medical students and residents.  Dr. Rees then spent a handful of years in a private practice environment.

Dr. Rees has spent his most recent years practicing at the Tucson VA.  He specifically chose the VA for the opportunity to give back and support our service men and women. Dr. Rees’ father and mother were both pilots in World War II and his mother won the Congressional Gold Medal as a women’s Air Force service pilot.  Dr. Rees’ son is a Marine in the reserves.  Dr. Rees is an assistant professor of medicine for the University of Arizona.  He was responsible for the third year medical students from the University of Arizona who would complete their internal medicine rotations at the Tucson VA.

Dr. Rees has a strong interest in preventative medicine.  He believes the best way to practice medicine is through a preventative approach.  He’s been very active his entire life, playing various sports and he continues to go to the gym on a regular basis.

In addition to his son, Dr. Rees also has 2 daughters.  His parents met in Douglas, AZ and his oldest sister was born in Bisbee.  When he’s not spending time with his family, Dr. Rees can usually be found at the gym, attending a live music or sporting event or taking in a good movie.                 

Katie Krahe, MS, PA-C

Katie completed her undergraduate studies at Northern Arizona University, preparing her for advanced studies at A.T. Still University, where she graduated with a Masters of Public Health and a Masters of Physician Assistant. Her tenure in medicine has included Clinical Coordinator at Hll-top Research and Clinical Research Advantage. She has practiced locally with Caring for Families, Regent Medical Urgent Care, and a Telemetric Practice.


Kayla Sullivan, PA-C

In 2013, Kayla Sullivan earned her Bachelor of Science degree in Biomedical Biology from the University of Arizona while working as a certified nursing assistant. She completed her Masters of Medical Science degree from Midwestern University in Glendale, AZ, with a focus on Physician Assistant Studies in 2016. She is board certified by the National Commission on Certification of Physician Assistants and a member of the American Academy of Physician Assistants. Kayla grew up in Phoenix, AZ  and enjoys spending time with friends and family, practicing martial arts, going to the movies, seeing theater productions and sight-seeing. She and her husband are dog lovers and love to train and take their two Labrador retrievers on long walks.