About Us

FVHO has been caring for patients in the Fox Valley and beyond since 1990, with an emphasis on respecting each patient as a person with unique issues, hopes and needs. By providing advanced care close to where many of our patients call home, our goal is to keep what’s best for the patient at the center of each treatment plan. There are many choices when it comes to cancer treatment, and we are proud to be the first choice of patients and families in our area.



Drs. William Guenther and Tom Ryan founded FVHO in 1990. Dr. Guenther had started his solo practice in Appleton in 1988, but as the need for cancer care in the Fox Valley grew, he knew it would take a team to provide the highest quality care for area patients.


FVHO’s services have expanded over the years as local healthcare systems have relied on the knowledgeable, experienced team more and more. Each stage of FVHO’s growth has been based on one principle: meeting the needs of the community to provide the best possible care, close to home.