Oncology Nurses & Staff

Shaw Regional Cancer Center oncology nurses and staff provide compassionate cancer care for patients while they manage individualized cancer treatments. Our oncology nursing staff includes:

Maricela Avila, RMA
Maricela is a registered medical assistant at Shaw. She graduated from Santa Barbara Business School for Medical Assisting. In 1997, Maricela moved to Colorado and began her career at Vail Valley Medical Center.
Susan Bobb, RN, OCN
Susan is a full-time radiation oncology nurse and is chemotherapy certified to assist in the infusion area. After working in health care for eight years, Susan returned to school and received her nursing degree from Front Range Community College in Westminster, CO.  While working at St. Joseph Hospital, she discovered a passion for oncology and joined the team at Shaw in 2008. Since then, she has obtained her Oncology Nurse Certification.
Margaret Brammer, LCSW
Social Worker/Survivorship Coordinator
A licensed clinical social worker, Margaret provides counseling services and works with patients and families to identify additional resources to support their journey through cancer. Margaret has a master’s degree in social work from Virginia Commonwealth University. She serves as a regional board member for the National Association of Social Workers and is also a member of the Association of Oncology Social Workers.
Peggy Carey, RN, BSN, MPA, FACHE
Vice President
With a BSN and master's degree in public administration-healthcare, Peggy began her career at the St. Charles Health System as a staff/charge nurse and progressed to become the cancer program director, then oncology service line director. She founded the Sara Fisher Breast Cancer Project and co-founded Heaven Can Wait Walk/Run to raise support for women with breast cancer. She is a Fellow in the American College of Health Care Executives and serves on the Board of the Association of Cancer Executives.
Susan Cline, B.S., RT(T), CMD
Susan is the lead radiation therapist and certified medical dosimetrist at Shaw Regional Cancer Center. She began her training as an emergency medical technician, and received her Bachelor of Science degree in Health Science Radiation Therapy. Susan did clinical rotations at UCLA, UC Irvine, Long Beach Memorial, Hoag Hospital and Kaiser Permanente. She is certified in massage therapy and medical dosimetry.
Kayla Dreesen, RT
Kayla is a radiation therapist at Shaw and also works at Vail Valley Medical Center as a radiologic technologist. She earned her associates degree in radiologic technology and radiation therapy from Mitchell Technical Institute and performed clinical rotations in Sioux City, IA and Rapid City, SD before moving to Colorado in 2009. Kayla has been a member of the American Society of Radiologic Technologists since 2006.

Sara L Fleszar, Pharm D
Clinical Oncology Pharmacist
Sara earned her doctorate of pharmacy at Shenandoah University and completed a hospital residency at St. Joseph’s Candler Health System, where she managed the out-patient cancer center. She worked in a bone marrow transplant unit at Presbyterian St. Luke’s before joining the Shaw team.

Sarah Giovagnoli, MS
Exercise Physiologist
Sarah coordinates the Spirit of Survival program at Shaw. She received her Master's Degree in exercise physiology from the University of Colorado and completed a cancer exercise specialist program through the Rocky Mountain Cancer Institute at University of Northern Colorado. Sarah is a member of the American College of Sports Medicine and is also a childbirth instructor for Vail Valley Medical Center.
Leslie Grimes, MS, CGC
Certified Genetic Counselor
Leslie is available to evaluate patients with a significant personal or family history of cancer to assess their likelihood of carrying a mutation for a hereditary cancer syndrome.  She earned her master’s degree at University of Colorado Denver, and achieved national certification through the American Board of Genetic Counseling.
Christine Hasselbach, DPT, CLT
Physical Therapist
Christine received her master's degree and clinical doctorate in physical therapy from the University of Colorado. Prior to moving to the Vail Valley and pursuing her role as a physical therapist at Shaw Regional Cancer Center, Christine worked at the University of Colorado Hospital in Denver, where she treated a wide variety of patients from infants to adults. She is also lymphedema certified.   
Melaine Hendershott, RD
Melaine is the registered dietitian at Shaw, where she counsels patients on nutritional issues in cancer care. Melaine began her career at Porter Hospital as the oncology dietitian for both outpatients and inpatients. She relocated to the Vail area and has been working for Shaw since 2005. She completed a master's degree in nutrition in 2009 through Rosalind Franklin School of Medicine.   
Merrill Mann, M.S., QMP, DABR
Medical Physicist
Merrill received her master’s in medical physics from the University of Colorado Health Sciences Center and is board certified by the American Board of Radiology in therapeutic radiologic physics. She worked at the University of Colorado Hospital, Presbyterian St. Luke’s Medical Center, and Exempla Lutheran Medical Center. Merrill maintains and implements technology, oversees quality assurance, and verifies treatment delivery.
Kim Lyons-Mitchell, MLIS
Medical Librarian
Kim is the medical librarian for Shaw Regional Cancer Center and Vail Valley Medical Center. She received a master's degree in library and information science from the University of Texas at Austin. Prior to moving to the Vail Valley, Kim was an assistant professor/medical librarian at the University of the Pacific in Stockton, California. She joined the team at Shaw in 2001 when the library was created.
Leesa S. Samuels, RN, BSN, OCN
Leesa is a certified medical oncology nurse in the infusion center. She received her BSN from Vanderbilt University and began her nursing career as a pediatric hematology/oncology nurse. Her experience also includes pediatric and neonatal intensive care. With a passion for oncology, Leesa came to Shaw in 2007. She enjoys interacting with her patients and providing education and support to the them during their chemotherapy regimens.
Marisa Sheehan, CMD
Marisa is a certified medical dosimetrist at Shaw. She began her training at Henry Ford Hospital in Detroit and is a member of The American Registry of Radiologic Technologists in diagnostic radiology and radiation therapy. Marisa creates computer-modeled treatment plans and works closely with medical physicists in data analysis, quality assurance, and treatment planning and delivery process improvement.   
Lynn Tremblay, RN, OCN
Lynn is a medical oncology infusion nurse and charge nurse. She received her nursing degree at Palomar Community College in San Marcos, California, and worked as an administrative assistant for 13 years prior to returning to nursing school and then working for a plastic and reconstructive surgeon in La Jolla, California. Lynn moved to Portland, OR, in 2003, where she began working in oncology. She moved to Colorado in 2007 to join the Shaw team.  
Angela C. Van Dyke, RT
Angela has been a radiation therapist at Shaw Regional Cancer Center since 2001. She began her training at Mesa State College in Grand Junction, and became a member of The American Registry of Radiologic Technologists in diagnostic radiology in 1983 and in radiation therapy in 1988. Angela was a radiation therapist at St. Mary's Hospital in Grand Junction, Colorado, for nine years.   
Van Dyke
Hilary Welch-Petrowski
Exercise Physiologist
Hilary earned her master's degree in exercise physiology from Pennsylvania State University and is a certified clinical exercise specialist with the American College of Sports Medicine. She has worked extensively in cardiac rehabilitation and with cancer populations at Shaw Regional Cancer Center. Hilary is also a ski instructor at Beaver Creek and a personal trainer.

Kelly White MSN, APN, ANP-BC
Breast Cancer Patient Navigator/Nurse Practitioner
Kelly brings over 10 years of oncology nursing experience to Shaw. She guides the care of patients, insuring timely diagnosis, treatment, and survivorship care. Coordinating appointments and providing education on treatment and available support resources, Kelly provides a single point of contact to help navigate patients through the process.