Care Team

Our nationally registered skilled technologists provide exceptional quality using state-of-the-art diagnostic equipment during the sleep study to ensure quality care.



Jason Cornelius, MD

Dr. Cornelius serves as Medical Director of the Sleep Medicine program and Chief of Neurology for North Memorial Health Care. He is board-certified in both Neurology and Sleep Medicine. His Neurology residency and Sleep Medicine fellowship training were completed at the Mayo Clinic (Rochester, MN).

Amy Knopke-Mooney, MD

Amy Knopke-Mooney, MD, is board certified in internal medicine, pulmonary, critical care and sleep medicine. She graduated from the University of Minnesota in 2001. She completed her residency training at Hennepin County Medical Center in 2004 and her fellowship training at the University of Minnesota in 2007.

Andrew Vaaler, MD

Andy Vaaler, MD, is board certified in internal medicine, pulmonary medicine and critical care. He is also board certified in sleep medicine and has extensive experience in the field. Dr. Vaaler lives in south Minneapolis with his wife and two children. He enjoys music of all kinds.

Ranji Varghese, MD

Ranji Varghese, MD, is a board certified psychiatrist. He completed his residency at the Mayo Clinic (Rochester) where he served as Chief Resident. He completed a Sleep Medicine Fellowship at the Mayo Clinic, where he conducted research on various sleep disorders. Dr. Varghese believes that a strong patient doctor relationship is the cornerstone for successful outcomes. He currently sees both adult and pediatric patients.