Meet Our Physicians

The Tammy Walker Cancer Center is fortunate to have expert physicians that have been treating patients with cancer for many years. The oncologists are affiliated with the Southwest Oncology Group through the University of Kansas Medical Center and the Mid-West Cancer Alliance. They are committed to providing cutting-edge cancer treatment for residents of north central Kansas.

Muhammad Ahmed, M.D.
Board certified in Internal Medicine and Medical Oncology, attended the Dow Medical College in Karachi, Pakistan, completed his Residency at Wayne State University, Detroit, MI and did his Oncology Fellowship at Medical College of Ohio, Toledo and Vanderbilt University, Nashville, TN.


Larry Beck, M.D.
Board certified in internal medicine, hematology, and medical oncology, attended the University of Kansas Medical School and completed his residency and fellowship at the University of Kentucky Medical School and University of Colorado. Dr. Beck sees patients with cancer and blood disorders.

Jeffrey M. Geitz, M.D.
Board certified in Internal Medicine, attended the University of Kansas School of Medicine in Wichita, KS, completed his residence at the University of Kansas School of Medicine in Wichita, KS, and did his fellowship at Saint Louis University (Hematology/Medical Oncology).

Claudia Perez-Tamayo, M.D.
Board certified in radiation oncology, attended the University of Illinois Medical School and completed her residency at the Medical College of Wisconsin and a fellowship at Daniel Den Hoet Cancer Center in genital urinary oncology. Cancer treatment is a family tradition for Dr. Perez-Tamayo - both her parents are radiation oncologists.

Peeran D. Sandhu, M.D.
Board certified in Internal Medicine and eligible for Medical Oncology, attended the Medical University of Lublin in Lublin, Poland, completed his residency at the University of Oklahoma's College of Medicine and did his fellowship at the University of Oklahoma's College of Medicine (Hematology/Oncology).