Colleen M Krajewski, MD

Alexander H. Shannon, MD Alexander H. Shannon, MD, is a surgical oncologist, specializing in gastrointestinal oncology, peritoneal surface malignancies, and metastatic colorectal, hepatobiliary, and neuroendocrine cancers. He has expertise in robotic surgery, hepatic arterial infusion therapy, and cytoreduction surgery with hyperthermic intraperitoneal chemotherapy (HIPEC). Dr. Shannon earned his medical degree from Tufts University School of Medicine in Boston. He completed his general surgery residency at the University of Virginia Health System in Charlottesville. He received additional training through a fellowship in complex general surgical oncology at The Ohio State University James Cancer Hospital in Columbus. Dr. Shannon is board certified in general surgery and in complex general surgical oncology by the American Board of Surgery. He is a member of the Society of Surgical Oncology. Having grown up in Pittsburgh, Dr. Shannon is grateful to be able give back and help people in this community. He welcomes patients ages 18 and older.

Rachel Toney, MD Rachel Toney, MD, is a gastroenterologist with AHN Medicine Institute. She provides patient-centered general gastroenterological care. Dr. Toney went to medical school at University of Virginia School of Medicine in Charlottesville, Virginia. She did a fellowship in gastroenterology at AHN Allegheny General Hospital in Pittsburgh, Pennsylvania. She is certified by the American Board of Internal Medicine — Gastroenterology and is affiliated with the American Gastroenterological Association. Dr. Toney welcomes patients ages 18 and older.

Perry J Tiberio, MD, PhD Perry Tiberio, MD, PhD, is a pulmonary and critical care medicine physician with AHN Medicine Institute, skilled at endobronchial ultrasound, pleural procedures, lung cancer, COPD, asthma, critical care, and interstitial lung disease. Dr. Tiberio earned his undergraduate degree in Bioengineering from the University of Pittsburgh, followed by his M.D. and Ph.D. from SUNY Downstate Medical Center in Brooklyn, NY. His doctoral research centered on developing innovative vaccination delivery systems aimed at preventing the spread of HIV. He completed his residency at Yale University where he implemented an HIV Pre-Exposure Prophylaxis clinical program. Most recently, Dr. Tiberio completed his fellowship at UPMC, where his research focused on sedation practices in critically ill, ventilated patients with a prior history of substance use disorder. Dr. Tiberio has authored numerous publications, received several teaching and research awards, and has presented his work at regional, national and international conferences. Dr. Tiberio is certified by the American Board of Internal Medicine in Internal Medicine, Pulmonary Medicine, and Critical Care Medicine. He is excited to join the Division of Pulmonary and Critical Care at Allegheny Health Network, where he will continue to pursue his passion in medical education and his love for clinical care, with a particular interest in ICU delirium, sedation of ventilated patients, and post-intensive care syndrome. Dr. Tiberio is looking forward to caring for adult patients throughout the greater Pittsburgh area.