Following medical school, Dr. Guenthner completed a transitional internship at St. Vincent Hospital and Health Services in Indianapolis, Indiana. He then completed a three-year Dermatology residency at Indiana University in Indianapolis where he served as the Chief Resident.
Dr. Guenthner is board certified as a Fellow of the American Academy of Dermatology. He is also a member of the Indiana Academy of Dermatology.
Beyond dermatology, Dr. Guenthner served on the board of the University of Iowa Alumni Association and was named the 2001 University of Iowa Alumni Association National Volunteer of the Year. In addition, Dr. Guenthner, an Eagle Scout, volunteers locally for the Boy Scouts of America.
Dr. Guenthner is married to Shannon (Powell) Guenthner, a 1998 graduate of the University of Iowa with a degree in social work. They have five wonderful children, Evan, Grace, Katherine, Margaret, and Matthew. As a family, they are heavily involved in the local community with children in various sports leagues and activities such as soccer and basketball, competitive horseback riding and dance. Philanthropically committed to the metropolitan area as well, the Guenthner Family supports various organizations such as the Indianapolis Zoo, Traders Point Christian Church