RMOS Board of Directors


Thomas Purcell
W. Thomas Purcell, MD, MBA
University of Colorado Hospital
Dr. Purcell is the Associate Director for Clinical Services of the University of Colorado Cancer Center and Executive Medical Director of Oncology Services at University of Colorado Hospital. He is an active member of the American Society of Clinical Oncology, serving on several committees including the Career Development Committee, Clinical Practice Committee, and Clinical Research Committee. In 2010 Dr. Purcell received the ASCO Statesman Award for his service to the organization.


Scott Kono
Scott A. Kono, MD
Kaiser Permanente Colorado
A native of Colorado Springs who enjoys outdoor sports, Dr. Kono originally intended to pursue a career in Sports Medicine, but quickly changed to oncology after completing his first clinical experiences. He is currently an oncologist for Kaiser Permanente and has a special focus in the treatment of cancers of the head, neck, and lungs. Dr. Kono believes the key to a strong physician-patient partnership in the fight against cancer is having a close relationship and open communication.


Deborah Cook
Deborah Cook, MD
Comprehensive Cancer Center

Dr. Cook graduated from the University of Colorado School of Medicine at Denver in 2000. She specializes in Hematology/Oncology and is affiliated with Good Samaritan Medical Center and St Joseph Hospital in Denver, CO.

Immediate Past President

Allen L. Cohn, MD
Rocky Mountain Cancer Centers

Dr. Cohn is a medical oncologist affiliated with multiple hospitals in the Denver area, including Avista Adventist Hospital and Castle Rock Adventist Hospital.

Dr. Cohn received his medical degree from University of Maryland School of Medicine and has been in practice for more than 20 years.

Membership Liaison

Brianna Hoffner
Brianna Hoffner, NP, MSN, RN
University of Colorado Cancer Center
Ms. Hoffner is the Lead Advanced Practice Provider, Medical Oncology, for the University of Colorado Denver. Prior to joining the University in 2015, she was the Lead Nurse Practitioner, Supervisor Clinical Research Operations for The Angeles Clinic and Research Institute in Los Angeles, California.

Ms. Hoffner earned her Master's of Science in Nursing, Adult Oncology, from Yale University.


Regina Brown
Regina Brown, MD
University of Colorado Cancer Center
Dr. Brown is Medical Director of Oncology at Lone Tree Medical Center, Assistant Professor of Medical Oncology at the University of Colorado, and a practicing physician at the University of Colorado Hospital. Her primary clinical interest is in breast and pancreatic cancers.
Eiko Browning
Eiko Browning, MD
Rocky Mountain Cancer Centers
Dr. Browning is a hematologist in Thornton, Colorado and is affiliated with multiple hospitals in the area, including Avista Adventist Hospital and Lutheran Medical Center. She received her medical degree from the University of Michigan.
Alex Menter
Alex Menter, MD
Kaiser Permanente Oncology/Hematology

Dr. Menter joined the Kaiser Permanente Oncology department in 2005 and currently serves as it's Quality and Value Advisor, as well as the Director of the Excellence in Cancer Care Committee.
Additionally, he has been leading the clinical trials program for more than eight years.

Dr. Menter has an interest in health services and cancer outcomes research, and has co-authored several research papers that have been published in peer-reviewed medical journals.

Wells Messersmith
Wells A. Messersmith, MD
University of Colorado Cancer Center
Dr. Messersmith joined the University of Colorado School of Medicine faculty in August 2007 as the Director of Gastrointestinal Medical Oncology. He is also the Head of the Division and Co-Leader of the Development Team in the Division of Medical Oncology. Dr. Messersmith is an active participate in the Drug Development Program and has his own clinical and translational laboratory, funded by the National Cancer Institute, that investigates developmental therapeutics for targeted therapies as well as correlative studies for use on human tissue samples. Outside of the university, Dr. Messersmith is a member of multiple national committees, including NCI GI Steering Committee, NCI Colon Cancer Task Force, National Comprehensive Cancer Network (NCCN) Committee on Colon/Rectal/Anal Cancers, NCCN Investigator Steering Committee, and the Medical Oncology Committee of the American Board of Internal Medicine.
Victor Villalobos
Victor Villalobos, MD, PhD
University of Colorado Denver
Anschutz Medical Campus

Dr. Villalobos joined UC Denver in 2014 as the Director of Sarcoma Medical Oncology and is also an active member of the Developmental Therapeutics program. He specializes in the treatment and management of soft tissue and bone sarcomas, and has research interest in the development of novel therapeutic regimens and modalities for treating different subtypes of sarcomas with new cytotoxic therapies.

Fellow Appointee

Gentry King, MD
University of Colorado Cancer Center

1801 Research Boulevard Suite 400
Rockville, MD 20850
Tel: 301.984.9496 | Fax: 301.770.1949
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