Dr. Russell O. Schub, FACG, FACP

Dr. Schub is board certified by the American Board of Internal Medicine in both Internal Medicine and Gastroenterology.  Dr. Schub completed his fellowship training in gastroenterology at Johns Hopkins University School of Medicine and Bayview Medical Center in Baltimore, MD.

He completed his undergraduate studies in Biology at Muhlenberg College in Allentown, Pennsylvania. He received his medical degree from the New York College of Osteopathic Medicine. He completed an internship and residency in internal medicine at Coney Island Hospital in Brooklyn, NY.

Dr. Schub has served as an Associate Professor of Medicine at the Uniform Services University of the Health Sciences. He was also honored as a Fellow in the American College of Physicians. He served as a Lieutenant Commander in the United States Navy, and as a gastroenterologist at Bethesda Naval Hospital.

In addition to patient care, he has been active in clinical research, teaching, and has authored numerous abstracts and articles. Dr. Schub’s multifaceted background continues to shape his individualized approach to patient care.

Deborah Jackson, CRNP

Deborah Jackson is a nationally certified registered nurse practitioner. She is graduate of the Master’s program for nursing from the University of Maryland Baltimore. She is a member of Sigma Theta Tau International Honor Society, a global community of nurses who lead in using scholarships, knowledge, and technology to improve the health of the world’s people. Deborah has over 20 years experience working in acute and non-acute health care settings.

Dr. Zheng Chen, PA-C, PhD

Zheng Chen is a physician assistant certified through the National Commission on Certification of Physician Assistant.

She graduated from Suzhou Medical College,China and obtained her PhD in Human Genetics from Fudan University, China. She completed her Physician Assistant training at Anne Arundel Community College and received a Master of Medical Science degree from Saint Francis University.

Zheng has extensive experience in both clinical practice and medical research.She was a physician in The Second Affiliated Hospital of Suzhou University, China. She was a postdoc fellow in National Institutes of Health and was awardedFellow’s Award for Research Excellence in Biomedical Research.

Zheng is fluent in English and Chinese.

Margaret Carpino, CRNP

Margaret Carpino is a Certified Registered Nurse Practitioner. She is a graduate of the Accelerated Nursing program at Johns Hopkins University, having obtained a BS prior in History. After graduation she worked for four years caring for acutely ill patients at Johns Hopkins hospital.

She was exposed to a diverse array of patients with complex medical needs during her time at the hospital. She frequently took care of patients with acute gastroenterological problems, and subsequently developed an interest in gastroenterology and hepatology. Upon graduation from the Nurse Practictioner program at Johns Hopkins University she joined a gastroenterology practice in Annapolis. She then joined Dr. Schub’s practice in 2008.

"Great experience. Very knowledgeable and friendly staff, excellent customer service. Dr. Schub was excellent, answered all questions and never rushed through my visits. Highly recommended."

Gary C

"I've been visiting Dr. Schub for years. I have never been dissatisfied whether it's an office visit or colonoscopy. The office is great! Dr's schub is very personable and explains everything very well. The colonoscopy procedure is great! The staff treats you very well while preparing. No pain, and great after care. I highly recommend this practice!!"

Melissa O

"Just saw Dr. Schub's page as a suggestion on here. It has been at least 10 years since I saw him and he did the best thing a doctor could do. He did the EGD down my throat. I was out, so I had no issues remembering a camera going down my mouth. We found the issue and fixed it. I've not had to see him again. That is how it should be. I shouldn't need years of follow up, but I know I'd go right back to him if I ever had an issue again."

Scott R

"A high pressure career resulted in several significant medical problems prior to my retirement. Thanks to Dr Schub and his outstanding staff, these problems were diagnosed early, resolved and monitored regularly, leading to my thoroughly enjoying retirement over the last 8 years. While EGD's and colonoscopy may not be the most enjoyable experiences, I'm extremely grateful for the extremely high quality care I've received."

Danigirl M