Meet our Key Staff:
Experience and backgrounds

A University of Florida College of Medicine faculty member since 1985, Dr. Mendenhall served as the chair of the Department of Radiation Oncology from 1993-2006. She has more than 20 years of experience and specializes in the areas of breast cancer, Hodgkin's disease, lymphomas and pediatric cancers. She also treats patients who have prostate cancer and other malignancies. Dr. Mendenhall is a leader in research, has extensive experience in cooperative group trials (COG) and has produced more than 137 published works, including articles in such publications as American Journal of Clinical Oncology, Cancer, and the Journal of the American Medical Association. In addition, she has been named in several leading women's magazines as one of the nation's top doctors for women with cancer. Currently, Dr. Mendenhall is responsible for the day-to-day clinical operations of the University of Florida Proton Therapy Institute.

Stuart Klein, MHA
Executive Director

Mr. Klein is responsible for the day-to-day administrative operations of the University of Florida Proton Therapy Institute. He has more than 20 years of experience as a health services administrator specializing in radiation oncology and finance for large university medical facilities. Author of the financial section of OncoLink, an internationally recognized oncology Web site, Klein is Assistant Dean & Lecturer at the University of Florida College of Medicine.

Zuofeng Li, DSc
Physics Director

Dr. Li is responsible for the day-to-day technical operations of the University of Florida Proton Therapy Institute. He has more than 10 years of experience, specializing in radiation physics, brachytherapy, image-based brachytherapy, and combined IMRT and brachytherapy delivery. He is an Associate Professor at the University of Florida College of Medicine, Department of Radiation Oncology.

Dr. Henderson is a Professor at the University of Florida's Department of Radiation Oncology and has served as the Medical Director for the University of Florida-Jacksonville Department of Radiation Oncology since 1998. He is a member of the Board of Directors of the Florida Society of Clinical Oncology, the Southern Association of Oncology, the Florida Division of the American Cancer Society and is a member of the Florida Cancer Council. Dr. Henderson specializes in the areas of gynecologic malignances and cancers of the lung, prostate and head and neck. His work has appeared in a number of scholastic publications.

A radiation oncologist and University of Florida Assistant Professor, Dr. Hoppe treats lung, lymphoma and prostate cancer patients. Prior to joining the University of Florida Proton Therapy Institute in 2008, he completed his residency training at Memorial Sloan Kettering Hospital where he was the Mortimer Lacher Clinical Lymphoma Fellow. An experienced researcher, he is published in numerous medical journals including the Journal of Clinical Oncology, Head and Neck, Bone Marrow Transplant and the International Journal of Radiation Oncology Biology Physics.

Dr. Indelicato joined the UF Proton Therapy Institute in 2008 and is an Assistant Professor in the Department of Radiation Oncology at UF. His specialties include sarcoma and pediatric cancers. Dr. Indelicato completed his residency training at University of Florida. Prior to his specialty training in radiation oncology, he completed an internship at Memorial Sloan-Kettering Cancer Center in New York. An established cancer researcher, he is the author of multiple book chapters and his research has been published in various peer-reviewed medical journals, including the International Journal of Radiation Oncology Biology and Physics, Medical Physics and Surgery. He has presented his findings at national and international medical conferences. Dr. Indelicato serves on the Board of Directors of the Pediatric Proton Foundation and on the national steering committee of the Lance Armstrong Foundation LIVESTRONG Young Adult Alliance. He is a member of the joint University of Florida-Moffitt Cancer Center Immunology and Experimental Therapeutics Programs. His research is funded by grants from the Lance Armstrong Foundation and the American Cancer Society.

A radiation oncologist trained at Mallinckrodt Institute of Radiology at Washington University Medical Center in St. Louis, Missouri, Dr. Malyapa specializes in the proton therapy treatment of skull base and spine tumors, as well as tumors of the head and neck and central nervous system. Prior to joining the University of Florida Proton Therapy Institute in 2005, Dr. Malyapa was assistant professor of radiation oncology at Washington University and a radiation oncologist at the University of Pittsburgh. In addition to his clinical expertise, he has research experience and training in radiation biology from Hiroshima University in Japan, where he received his Ph.D. His work has appeared in numerous publications, including International Journal of Radiation Oncology Biology Physics, Radiation Research and more.

Dr. Marcus brings more than 30 years of radiation oncology experience to his patients who require treatment for a wide range of malignancies including prostate cancer, Ewing's sarcoma, soft tissue sarcoma, bone and soft tissue malignancies and central nervous system tumors. In addition, he is a pediatric radiation oncologist with expertise in treating childhood cancers. Dr. Marcus has contributed more than 75 articles to medical journals including American Journal of Clinical Oncology, International Journal of Radiation Oncology Biology Physics, and Clinical Orthopedics and Related Research. A leader in both the national and international medical communities, he is listed in noteworthy publications such as The Best Doctors in America and Who's Who in America.

With over 20 years of experience in radiation oncology, Dr. Mendenhall is recognized as an expert in head and neck cancer as well as central nervous system, gastrointestinal and other malignancies. He also treats prostate cancer patients. He is a frequent contributor to medical journals, with more than 500 published works including Journal of Clinical Oncology, Head and Neck, International Journal of Radiation Oncology Biology Physics, and Cancer, and is regularly invited to speak at national and international oncology conferences. He is also recognized in publications such as The Best Doctors in America and America's Top Doctors. Currently, Dr. Mendenhall serves as Professor for the Department of Radiation Oncology at the University of Florida.

A radiation oncologist for more than 15 years, Dr. Nichols specializes in treating cancers of the lung and prostate. Prior to joining UF Proton Therapy Institute, he served as medical director of Bay Medical Regional Cancer Center, Panama City, Fla. Author or coauthor of more than 25 peer reviewed publications and meeting presentations, his work has appeared in the Journal of Clinical Oncology and the International Journal of Radiation Oncology Biology Physics. A University of Florida Department of Radiation Oncology assistant professor since 2008, he serves as the Radiation Therapy Oncology Group (RTOG) Principal Investigator for both the Jacksonville and Gainesville campuses.

A radiation oncologist, Dr. Xu treats a broad range of patients with cancers of the prostate, head and neck, central nervous system, breast, lung and digestive and reproductive systems. An assistant professor of radiation oncology at the UF College of Medicine, she completed her residency at Emory University where she served as senior resident of the Department of Radiation Oncology. Dr. Xu is active in clinical research, including cooperative group trials, and has presented her findings at peer-reviewed conferences such as the American Society of Therapeutic Radiation Oncology and the American Society of Clinical Oncology.

Dr. Chvetsov is Assistant Professor and Medical Physicist in the Department of Radiation Oncology at the University of Florida. He joined the clinical physics faculty staff in November 2006. Prior to joining University of Florida, Dr. Chvetsov held academic and clinical positions in medical physics at the Tom Baker Cancer Center, Calgary, Canada and Case Western Reserve University, Cleveland, USA. Dr. Chvetsov is certified in radiotherapy physics by American Board of Radiology and Canadian College of Physicists in Medicine. His specialties include image-guided radiotherapy, radiation biophysics and optimization problems in radiotherapy planning.

A medical physicist at the University of Florida Proton Therapy Institute, Dr. Flampouri provides patient treatment planning. She has been a University of Florida College of Medicine faculty member since February 2006. Her specialties include radiation physics, accurate dose calculation and treatment planning dose checking with simulations, IMRT and 4D CT planning.

As a University of Florida College of Medicine faculty member since 2005, Mr. Slopsema leads commissioning efforts for our proton therapy system. He is responsible for clinical implementation of the uniform scanning and pencil beam scanning technologies as well as the eyeline. In addition he is leading the proton quality assurance program at UF Proton Therapy Institute. His research is focused on the effect of motion in scanned proton beams, proton delivery techniques, and commissioning methods. He holds a M.Sc. degree in Applied Physics from the University of Twente (Netherlands) and gained proton therapy experience while working at Massachusetts General Hospital in Boston, MA.

An Associate Professor at the University of Florida's Department of Radiation Oncology, Dr. Yeung has more than 10 years' experience, with special interest in proton therapy, radiation physics, treatment planning, medical imaging applications and clinical software development.

Mr. Barlow manages the radiation therapist staff, overseeing the patient treatment scheduling, daily treatments, and simulation operations. He has more than 25 years of experience in the field of radiation oncology, including senior or management level roles for more than 12 years. He holds a Bachelor of Science in Radiologic Technology from the Medical University of South Carolina, is a Certified Radiologic Technologist and is a Registered Radiologic Technologist with the American Registry of Radiologic Technologists.

Mr. Hoff provides patients and caregivers support services including resources for housing, financial aid and recreation. He conducts orientation tours of the facility, coordinates group activities and outings and leads small discussion groups for brain/central nervous system, lung and head and neck patients.

Mrs. Holland manages the patient intake staff and is responsible for developing standards of excellence in customer service, including responding to new patient inquiries and scheduling new patient consultations. She has more than 25 years of experience at Fortune 500 companies as a consumer affairs and customer service executive.

Providing patients and caregivers with a comfortable environment, Ms. Mahoney is part of the team that facilitates group discussion, meetings and outings, ensures comfortable housing and provides information on recreation and entertainment opportunities. Her responsibilities include the pediatric program and wives and caregivers program.

Mrs. McIntyre is responsible for overseeing all interactions in regards to patient financial services between the patient's insurance company and the organization. With over 20 years of experience in the Health Care Industry, she brings a wealth of knowledge in many areas of patient services. With patient care being our primary priority, she ensures that accurate and prompt results are achieved, which are significant essentials throughout the billing process.

Ms. Prince manages the clinical research department -- the team that works with the Institute's principal investigators, scientists and physicians to develop, maintain and monitor clinical protocols and coordinate participation in cooperative group protocols with other leading cancer research centers. With more than 10 years of experience in oncology research and almost 20 in nursing, Ms. Prince was instrumental in establishing, and continues to oversee, the radiation oncology research program at the UF College of Medicine-Jacksonville campus.

Ms. Sapp manages the nursing staff and daily clinical activities including new consultations, weekly on-treatment visits and follow-up appointments. With an extensive background in pediatric care, including serving in the Neonatal Intensive Care Unit at a major academic hospital and as an oncology nurse at Nemours Children's Clinic, she coordinates the pediatric program at UF Proton Therapy Institute. She designs and implements nursing standards to deliver the highest quality patient care.

Mr. Troy is responsible for developing and implementing the comprehensive patient services program at the University of Florida Proton Therapy Institute. Prior to joining the University of Florida Proton Therapy Institute's staff, Mr. Troy developed and oversaw social support services for eight years at Loma Linda University Medical Center's proton facility. Mr. Troy is nationally and internationally known for pioneering the normative approach to support proton therapy patients.