Dr. Schub

Dr. Russell O. Schub, 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.


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.

陈政, PA-C, PhD


获得复旦大学遗传学博士学位,在Anne Arundel Community College 完成医生

助理训练并获得Saint Francis University 医学硕士学位,目前在Dr. Schub诊所


医生,在NIH 博士后期间荣获生物医学研究奖,具备丰富的临床和医学研究



Deborah Jackson, CRNP

Deborah Jackson is a nationally certified registered nurse practitioner. She is graduate
of the Masters program for nursing from 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.


Margaret Carpino, CRNPMargaret

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.