Meet the Providers

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 a 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 awarded Fellow’s Award for Research Excellence in Biomedical Research.

Zheng is fluent in English and Chinese.


Percentage of Patients who preferred Dr. Schub to other Gastroenterologists


Percentage of Patients stated the care they received here was Excellent, Very Good or Good


Percentage of Patients who stated their condition had improved with Dr. Schub when other G.I. Doctors had failed


Percentage of patients who preferred our Endoscopy Center over other centers they had visited


What People are Saying

“Great Experience”

"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

“Highly Recommended”

"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. 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

"It has been 10 years"

"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

“High Quality Care”

"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



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Hours of Operation

Mon-Fri : 7:30am – 5:00pm

Mon-Fri: 8:00am – 5:00pm

Mon, Tue, Thurs & Fri: 7:30am - 12:30 pm.

We are closed

Dr. Russell Schub
Advanced Endoscopy Center

8875 Centre Park Drive, Suite D
Columbia, MD 21045

PHONE: 410-489-3020
FAX: 410-730-2266

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