Heart, Lung and Vascular


Sarah Garfield, N.P.

Sarah Garfield is a Primary Acute Care Nurse Practitioner Board certified through AACN (American Association of Critical Care Nurses). She graduated with her Masters of Science in Nursing: Acute Care Nurse Practitioner from Grand Canyon University in 2016. Sarah knew from a young age that she wanted to work in… Read More »


Gretchen Schaber, N.P.

~ Cardiology ~ Gretchen Schaber is a Certified Geriatric and Adult Nurse Practitioner specializing in Cardiology. She received her Bachelor’s in Nursing from East Carolina University and her Master’s in Nursing from the University of Arizona. Gretchen Schaber has been a nurse since 1976, and practiced in Cardiology since 1986.… Read More »


Eric Olson, P.A.-C

~ Cardiology ~ Eric Olson is a Certified Physician Assistant specializing in cardiology. He received his masters degree in physician assistant (PA) studies from AT Still University in 1999 following his pre-med degree in Zoology from ASU in 1994. In addition to his work at Summit Heart Lung and Vascular,… Read More »


Simranjit Galhotra, M.D., MBA, FCCP

~ Pulmonary and Sleep Medicine ~ Simranjit Galhotra is board-certified in Pulmonary Disease and Sleep Medicine. He received his medical degree and his MBA from the University of Chicago. He completed his three-year Internal Medicine Residency at Washington Hospital Center in Washington, DC, and his three-year Pulmonary and Critical Care… Read More »


Brian Fuller, D.O., FACOI

~ Cardiology ~ Brian Fuller, D.O., FACOI is an Interventional Cardiologist. He is board-certified in Internal Medicine, Adult Cardiology and Nuclear Cardiology. He graduated from Kirksville College of Osteopathic Medicine in Kirksville, Missouri. He completed his internship and residency through Midwestern University at Tucson General Hospital in Tucson, Arizona. He… Read More »


Imran Ata, M.D.

~ Cardiology ~ Dr. Ata received his medical degree from Nishtar Medical College, Multan, Pakistan in 1985 and then completed his internship in Internal Medicine at Nishtar Medical College. He then joined the National Institute of Cardiovascular Diseases in Karachi, Pakistan and spent 7 years at the institute doing research… Read More »