Nurse Practitioner
David F. Castillo
David F. Castillo, a native of Grand Rapids, Michigan, attended Marquette University in Milwaukee, Wisconsin where he received his Bachelor’s of Science in Nursing. Prior to pursuing a career as a NP, he worked at both Banner Thunderbird Medical Center and the Phoenix VA in the Cardiology department for over 4 years as a RN. He received his Master’s of Science in Nursing degree from Saint Louis University. He is board certified by the American Nurses Credentialing Center and is licensed by the Arizona State Board of Nursing as an Acute Care Nurse Practitioner. Prior to joining Cardiac Care Consultants in February 2013, he worked in the Critical Care department at Tucson Medical Center and at a private Neurosurgery practice in Phoenix as a NP. He works at Banner Boswell Medical Center and Banner Del E. Webb Medical Center.
Nurse Practitioner
Crysta Silas
Crysta Silas is a native from Indiana, where she obtained a Bachelor of Science in Nursing from Indiana Wesleyan University, in Marion, IN. Prior to pursuing a career as an NP, she worked in progressive cardiac care for 5yr and in the Cardiovascular Transplant ICU for 3yr at St Vincent Hospital in Indianapolis. She then decided to pursue her Master of Science in Nursing from Spring Arbor University. She is board certified by the American Academy of Nurse Practitioners and is licensed by the Arizona State Board of Nursing as a Family Nurse Practitioner. She works at Banner Boswell Medical Center and Banner Del E. Webb Medical Center.
Nurse Practitioner
Travis Nye
Travis grew up in Iowa and relocated to Arizona in 2012 after completing his Associates in Nursing from Indian Hills Community College in Iowa. He then began working as an RN on a stroke and seizure unit at Boswell Hospital in Sun City where he continued to work for 12 years. Travis completed his BSN through Arizona State University in 2019. While continuing to work at Boswell, Travis completed his Doctorate of Nursing Practice at ASU in 2024. Travis is certified as a Family Nurse Practitioner through the American Academy of Nurse Practitioners and licensed by the state of Arizona. Travis works at Banner Boswell Medical Center and Banner Del E. Webb Medical Center.
Physician Assistant
Katharine Ross
Katharine is a NCCPA certified and Arizona licensed physician assistant who was born and raised in Scottsdale, Arizona. She studied physiology and Spanish at the University of Arizona in Tucson, graduating with her Bachelor degree in December of 2018. She then spent the next year and a half working as an orthopedic assistant at a private hand surgery practice in North Phoenix. She graduated from Midwestern University in 2022 with her Master of Medical Science in Physician Assistant Studies, graduating at the top of her class. She is also a member of the American Academy of Physician Assistants. She is passionate about cardiology and building strong relationships with her patients. She works at Banner Boswell Medical Center and Banner Del E. Webb Medical Center.