Physicians and Staff
Robert A. Hanson, DO FACOI

Dr. Robert Hanson attended Michigan State University for his bachelors, graduate and medical school education. He graduated medical school in 2005. He underwent internship training at Henry Ford hospital, in Detroit, Michigan, and went on to complete his Internal medicine residency (2008) and Cardiology fellowship (2011) at Pontiac Osteopathic Hospital, in Pontiac Michigan.
His other interests include Tropical and Travel Medicine. He has been actively involved in clinical and laboratory based research and has received 2 research scholarships from the National Institutes of Health (NIH) and has conducted collaborative research with the Centers for Disease Control and Prevention (CDC).
Dr. Hanson served in the U.S. Air force from 1987-1991 (Desert Shield / Storm). After his honorable discharge, he attended Michigan State University to further his education. He served as the Director of Cardiovascular Services at the Battle Creek and Wyoming Michigan Veteran's Affairs Hospital for about 2.5 years prior to joining us. He is board certified in Internal and Cardiovascular Medicine and is a strong advocate of disease prevention through healthy lifestyle and nutritional choices.
Melissa J. Mattison, NP

Melissa Mattison is a Family Nurse Practitioner and joined East Valley Cardiology in 2014. She is originally from South Dakota and earned a dual Bachelor’s Degree in biology and business from Arizona State University in 2005. She then received Associates in Nursing from Gateway Community College in 2008. Melissa practiced as a Registered Nurse in the Cardiovascular Intensive Care Unit at Banner Heart Hospital and brings with her a wealth of knowledge and experience in caring for patients with complex cardiovascular disease. Melissa earned her Master of Science in Nursing from Grand Canyon University in 2013. She then received a national certification from the American Association of Nurse Practitioners in family practice. Melissa and her husband, Jeff, have two beautiful boys, Jacob and Jase.
Jamie L. Harris, NP

Jamie Harris is a Family Nurse Practitioner from Lincoln, Nebraska. She recently moved to Arizona to be closer to family and to escape the long midwestern winters. Jamie earned her Registered Nursing Diploma degree from Bryan College of Health Sciences in 1999, then later returned to Bryan to complete her bachelor’s degree in the Science of Nursing. She practiced as a Registered Nurse at the Nebraska Heart Hospital, in Lincoln Nebraska, for 15 years where she specialized in interventional cardiology, electrophysiology, and vascular services. In 2019 she earned her Masters degree in Nursing from Clarkson College in Omaha, Nebraska. Jamie obtained national certification from the American Association of Nurse Practitioners in family practice. In her free time Jamie enjoys reading, hiking, golfing, and spending time with her family.
Katherine E. Reynolds, FNP-C

Katherine Reynolds is a Certified Family Nurse Practitioner. She is originally from Illinois where she attended Illinois State University to earn a Bachelor’s Degree in Nutrition. She returned for a second Bachelor’s of Science in Genetic Biology. Katherine became a Registered Nurse in 2010 after receiving an Associates Degree in Nursing from Parkland College in Champaign, Illinois. She has practiced as an Registered Nurse across multiple specialized units at Advocate Bromenn Hospital in Normal Illinois. In 2014, Katherine and her family moved to Arizona where she worked at Mercy Gilbert Medical Center until earning her Master’s Degree in Nursing from Grand Canyon University in 2019 to become a Family Nurse Practitioner. She is passionate about empowering patients with knowledge to make educated choices for their own health. Katherine enjoys reading mysteries, traveling to new places and spending time with her husband and children.