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Our Providers

Meet Our Team

Dr. Allan L. Hardy, MD

Dr. Allan L. Hardy, MDDr. Allan L. Hardy returns to Fredericksburg, joining Fall Hill Gastroenterology Associates in December 2021. He is originally from Durham NC and graduated from the Hampton University Honors College in 1996 with a B.A. in Biology. Dr. Hardy attended medical school at MCV/VCU School of Medicine in Richmond VA. After medical school he completed a residency in Internal Medicine at Howard University Hospital where he served as Housestaff President, Chief Resident and received 4 student teaching awards. After his initial 3-year Gastroenterology Fellowship at Howard University Hospital he completed a one-year Advanced Endoscopy Fellowship at UNC-Chapel Hill where he received specialized training in more procedures and conditions (Endoscopic Ultrasound, Endoscopic Retrograde Cholangiopancreatography, Irritable Bowel Syndrome, and Esophageal Diseases).

After Advanced Endoscopy training he joined a very successful Gastroenterology group in Savannah, GA where he served as an Assistant Professor at Memorial University Medical Center. During that time he worked directly with medical students and residents and gave lectures on Internal Medicine Board preparation, and a Grand Rounds presentation “Obesity: Eat Meat or Cut the Gut”.

Pursuing his interest in Obesity Medicine, Dr. Hardy became board certified in Obesity Medicine in 2018 and has served on the Speakers Bureau Committee and the Advocacy Committee for the Obesity Medicine Association. As a member of the Advocacy Committee he has petitioned members of Congress and Senate on Capitol Hill regularly to promote passage of TROA (Treat and Reduce Obesity Act) which would allow for better insurance coverage for patients suffering from the disease of Obesity.

Dr. Hardy was most recently with the Division of Gastroenterology at Augusta Health Hospital in Fishersville, VA where he served as the Gastroenterology Medical Director (2015-2019) and was a guest lecturer at the Murphy Deming College of Health Sciences Physician Assistant program (affiliated with Mary Baldwin University) and an Assistant Professor in the Department of Medicine at Edward Via College of Osteopathic Medicine (affiliated with Virginia Tech University). During his time at Augusta Health he twice gave lectures for a nationally renowned Internal Medicine Board Review program. In 2018 he created a “Gastroenterology Metabolic Clinic” for weight loss, which was expanded to the “Lifestyle and Weight Management Program at Augusta Health” in 2019. He has helped many patients to lose 10-20% of their total bodyweight to improve their fatty liver, reflux, and diabetes control. In 2020 he was awarded “Lecturer of the year” by the Murphy Deming Physician Assistant program. He is married to Leticia Helleby-Hardy, MD.

Dr. Thomas A. Mastri, MD

Dr Thomas Mastri MDHe has been named as a Top Doctor in Northern Virginia Magazine.Currently he is the Medical Director of Fall Hill Gastroenterology Endoscopy Center and a partner in Fall Hill Gastroenterology Associates. He is a graduate of Robert Wood Johnson Medical School, NJ, in 1985. He completed his Internal Medicine residency at the Medical College of Pennsylvania in 1989.He later served as Chief Resident of Internal Medicine at Episcopal Hospital, Philadelphia. His Gastroenterology fellowship was completed at the Boston Veterans Administration Medical Center in 1991.He became Board Certified in Gastroenterology by the American Board of Internal Medicine in 1991.

He spent nine years working for the Geisinger Medical Group in Pennsylvania prior to joining Fall Hill Gastroenterology Associates in 2000.

Dr. Mastri resides with his wife and family in Spotsylvania. He is active in the public school system and has coached young soccer. He is an avid photographer.

His special medical interests include gastrointestinal and liver diseases, diagnostic and therapeutic endoscopy, video capsule endoscopy and colon cancer screening.

Dr. Lawrence W. Comerford, MD, MS,AGAF

Dr. Comerford joins Fall Hill Gastroenterology Associates in 2019 after 16 years as a practicing Gastroenterologist, most recently at Augusta Health in Fishersville, Virginia.

He is a graduate of the U.S. Naval Academy in Annapolis Maryland in 1983 and spent 10 years in the US Navy as an engineering duty officer working on nuclear submarines and in shipyards. He graduated with a Masters of Science in Mechanical Engineering from the Naval Postgraduate School, Monterey, CA.

He earned his medical degree at the Medical University of South Carolina (MUSC), Charleston SC in 1997.

He completed his Internal Medicine Residency at Mayo Clinic, Rochester MN in 2000. He was awarded the Mayo Department of Medicine’s “Attitude, Commitment, & Excellence Award” in 2000.

In 2003, he completed his Gastroenterology Fellowship at the University of Virginia, Charlottesville, VA . He also participated as a NIH Clinical Research Training Fellow in Digestive Diseases while at UVA. He won the American College of Gastroenterology Fellow Clinical Research Award in 2003. He received his Masters of Science in Health Evaluation Sciences at UVA in 2004.

Dr. Comerford served on the gastroenterology faculty of both the University of Virginia (2003-2005), MUSC (2006-2013), and Edward Via College of Osteopathic Medicine, Blacksburg, VA, 2017-2019 where he has taught medical students, residents, and GI fellows. He received the MUSC Department of Medicine Excellence in Teaching Award in 2008. He served as Head of the Inflammatory Bowel Disease (IBD)Section at MUSC and was active in clinical research in IBD publishing papers and book chapters. He has presented abstracts and been an invited speaker at National medical conferences.

He became Board Certified in Gastroenterology by the American Board of Internal Medicine in 2004. He is a Fellow in the American Gastroenterological Association.

He was a recipient of a Our Health Charlottesville and Shenandoah Valley Magazine’s 2018 Best Bedside Manner Award.

He has 4 grown children and lives in Hanover Virginia. He has been an adult leader in the Boy Scouts of America. His current recreational activities include sailing, fishing, hiking, and travelling.

His medical interests include general gastrointestinal and liver diseases, inflammatory bowel disease, general endoscopy including colon cancer screening, and video capsule endoscopy.

Dr. Barbara J. Arcarese - Clinical Pathologist

IMG_28311Dr. Barbara J. Arcarese is a graduate of the New York College of Osteopathic Medicine, Old Westbury, NY. She completed her residency in anatomical and clinical pathology at St. Luke’s- Roosevelt Hospital in New York, NY in 2007. In 2009 she completed her fellowship in Surgical Pathology at the Yale University School of Medicine, Bridgeport hospital, Bridgeport, CT. From 2009 to 2011 she worked as the Blood Bank Director and a clinical/anatomical pathologist with Central Connecticut Pathology Consultants in New Britain, Ct.

Dr. Arcarese resides in Richmond, VA with her husband, a cardiologist, and 2 children.

Sanita Piya - Family Nurse Practitioner


Sanita is a Board Certified family nurse practitioner. She graduated from Chamberlain College of Nursing, Chicago, IL in 2016. She received her Bachelor in Science of Nursing from B.P. Koirala Institute of Health Sciences, Nepal in 2003.

She has dedicated more than 10 years of her life in caring patients with utmost creativity, best knowledge, skills and experiences to address patient’s issues and problems to deliver most efficient care. She is a member of American Association of Nurse Practitioners and Society of Gastroenterology Nurses and Associates, Inc.

She resides with her husband, a Pediatric Cardiologist and 2 children in Stafford, VA. She enjoys cooking, decorating and spending quality time with her family.

Leslie Cooper- Family Nurse Practitioner


Leslie is a Board Certified family nurse practitioner. She graduated from Indiana State University FNP program in 2017 and received a Masters in Science of Nursing. Prior to becoming a nurse, she worked as a Correctional Deputy for Riverside County Sheriff's Department in Southern California for 6.5 years. She started her nursing career after completing an LPN certificate program through North West College in 2006. Later she went on to completed an LPN to BSN bridge program and received a Bachelor in Science of Nursing in 2011. She has over 13 years of nursing experience in general medicine and various subspecialties such as oncology, cardiology, renal-respiratory.

She resides with her husband and two children in Fredericksburg, VA. Her interests include travel, and outdoor activities with the family to include kayaking, stand up paddle boarding, water skiing, and snow skiing.

Jenny Potter - Family Nurse Practitioner


Jenny is a certified Family Nurse Practitioner. She graduated with honors from Simmons University in 2020 and earned a Master of Science in Nursing. Jenny joins our team after having worked as an ICU RN for 10 years. She started her nursing career in Cleveland, Ohio as a nursing assistant and earned her associate's degree in nursing from Cuyahoga Community College. After moving to Virginia, she married and earned her BSN from Walden University. Within a year, she was enrolled for her MSN.

Jenny lives in Woodbridge, VA with her husband, 2 children and 2 greyhounds. Her interests include her family, greyhounds, cheering for the Cleveland Browns and Green Bay Packers, and beach vacations.