Meet the Chartrounds Team

Patricia Harrigan Hardenbergh, MD
Medical Director of Radiation Oncology, Shaw Regional Cancer Center, Edwards Colorado
Chartrounds Founder and Award recipient of the ASCO Conquer Cancer Foundation Improving Cancer Care Grant, funded by Susan G. Komen for the Cure.

Patti attended the combined program of  Dartmouth Medical School, and Brown University Medical School, earning her medical degree in 1991.  She completed her residency in Radiation Oncology in 1996  at Harvard Medical School and subsequently taught and pursued cancer research while on faculty at Duke University Medical Center.  Her career took on new challenges when she moved to a small community practice at Shaw Regional Caner Center in rural Edwards, Colorado.  The experience of straddling the worlds of academic medicine and community practice gave her insight into the need for a bridge between the two.  Emails are welcome at

She serves as a member on ASTRO's Health Services Research Committee with contributions to the published work on national guidelines on Partial Breast Irradiation and Hypofractionated Whole Breast Irradiation. She was recently elected to be the community physician's representative on the nominating committee for the ASTRO Board. She played a major role in the design and development of the partial breast irradiation device now called SAVI.  Dr. Hardenbergh is the author and co-author of over 35 peer-reviewed publications. She presently serves as an examiner for the written and oral boards for the American Board of Radiology.

Tyler Robin, MD, PhD
Assistant Professor, Radiation Oncology
University of Colorado Cancer Center
Chartrounds Leadership Team

Tyler is an assistant professor of radiation oncology at the University of Colorado School of Medicine, with specialization in genitourinary and gynecologic cancers, brachytherapy, Stereotactic Body Radiation Therapy (SBRT) and Stereotactic Radiosurgery (SRS). He graduated from Colorado College cum laude with Distinction in Biology. He completed the combined MD/PhD program at the University of Colorado, where he studied strategies to improve the effectiveness of cancer therapies with support from the National Cancer Institute. He completed the radiation oncology residency training program at the University of Colorado where he served as chief resident. 

He joined the Chartrounds team in 2017. He played a key role in the Chartrounds global health initiative through his involvement in Chartrounds India, and is now excited to help facilitate the newest Chartrounds site, Chartrounds Brachytherapy- a collaboration between and the American Brachytherapy Society.

Stacey McMahon

Stacey McMahon joined Chartrounds in July 2010 to develop our reputation and increase membership. She brings 20 years of sales and marketing experience to the team and, equally important, a commitment to our mission of improving cancer care.

Stacey’s business background and experience are extensive. She was a top Account Executive at Infinium Software and has worked as a Major Account Sales Manager at Automatic Data Process and RPS. She is a partner at the Zanon Group, a sales consulting firm.

Stacey has developed sales training programs and leadership development training. In all of her work, her principles are consistent and clear: doing what is right for the common good, and doing it well.  Stacey graduated from Boston College School of Management.  


Kim Lyons-Mitchell, MLIS
Chartrounds Medical Librarian

Kim Mitchell began her education in biology and received her Bachelor of Arts in 1993 from the University of Texas at Austin. She received a Masters in Library and Information Science, graduating in 1998 from the University of Texas at Austin. She works closely with physicians to ensure that they have up-to-date medical information.  Kim is taking charge of editing and tagging the archives of Chartrounds sessions. They will have a librarian's touch of organization and indexing.



Andy Ball
Program Administrator; CFO; HIPPA CO
Andy has worked in healthcare administration for over 13 years. Doctors respect him for his tenacity and attention to details.  He graduated from Colorado State University in 1987 with a B.A.  After spending 3 years volunteering for Senator Robert Dole and Congressman Ben Nighthorse Campbell, he earned a Masters of Public Administration from the University of Colorado in 1993.  During his years in college and D.C., he always paid his bills as the sous chef in award winning restaurants in each town where he honed skills for cost-effectively implementing the ideas of his employers with the goal of impeccable customer service.  After several years traveling the U.S. as a legal analyst for law firms, Andy chose to settle down at a hospital that was constructing a cancer center.  Upon its opening, he was the Office Supervisor and Revenue Cycle Coordinator for 10 years. His latest goal is to make this grant program a user-friendly and valuable MOC resource to improve cancer care.
  Brigitta Gehl 
Administrator and Research Assistant
Brigitta graduated from the University of Rochester in New York in 2014 where she majored in Molecular Genetics and is currently completing her Masters in Public Health at George Washington University with a concentration in Global Health. She plans to pursue medical school and has a particular interest in pediatrics. Brigitta grew up in Vail, Colorado and enjoys playing volleyball, running, and working at the family bistro.