Gastroenterology
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Olumide Ajayeoba, M.D.

Gastroenterologist

Riverside Gastroenterology Specialists - Newport News
Riverside Gastroenterology Specialists - Hampton

Dr. Ajayeoba's medical interests include gastrointestinal bleeding, gastroesophageal reflux disease, colon polyps, bile duct disorders, Barrett’s esophagus and chronic pancreatitis.

Meet Dr. Ajayeoba 


Shahwali Arezo, M.D.

Gastroenterologist

Riverside Gastroenterology Specialists - Williamsburg
Riverside Gastroenterology Specialists - Gloucester

Dr. Arezo's medical interests include the diagnosis and treatment of conditions related to the digestive system, including the esophagus, stomach, colon, liver, gallbladder and pancreas.

Meet Dr. Arezo | Request an Appointment


John W. Boyd, M.D.

Gastroenterologist

Riverside Gastroenterology Specialists - Newport News
Riverside Gastroenterology Specialists - Hampton

Dr. Boyd's medical interests include the diagnosis and treatment of conditions related to the digestive system, including the esophagus, stomach, colon, liver, gallbladder and pancreas. He routinely performs colonoscopies, endoscopies and other advanced diagnostic and therapeutic procedures.

Meet Dr. Boyd | Request an Appointment


Joseph O. Converse, M.D.

Gastroenterologist

Riverside Gastroenterology Specialists - Newport News

Dr. Converse's medical interests include the diagnosis and treatment of conditions related to the digestive system, including the esophagus, stomach, colon, liver, gallbladder and pancreas. He routinely performs colonoscopies, endoscopies and other advanced diagnostic and therapeutic procedures.

Meet Dr. Converse | Request an Appointment


Frederick M. Gessner, M.D.

Gastroenterologist

Riverside Gastroenterology Specialists - Newport News
Riverside Gastroenterology Specialists - Hampton

Dr. Gessner's medical interests include the diagnosis and treatment of conditions related to the digestive system, including the esophagus, stomach, colon, liver, gallbladder and pancreas. He routinely performs colonoscopies, endoscopies and other advanced diagnostic and therapeutic procedures.

Meet Dr. Gessner | Request an Appointment


William A. Hackworth, M.D.

Gastroenterologist

Riverside Gastroenterology Specialists - Newport News
Riverside Gastroenterology Specialists - Hampton

Dr. Hackworth's medical interests include the diagnosis and treatment of conditions related to the digestive system, including the esophagus, stomach, colon, liver, gallbladder and pancreas. He routinely performs colonoscopies, endoscopies and other advanced diagnostic and therapeutic procedures.

Meet Dr. Hackworth | Request an Appointment


Rafayat S. Hossain, M.D.

Gastroenterologist

Riverside Gastroenterology Specialists - Newport News
Riverside Gastroenterology Specialists - Hampton

Dr. Hossain's special interests include endoscopic treatment of gastrointestinal bleeding, colon cancer screening, gastroesophageal reflux disease, peptic ulcer disease, viral hepatitis, and fatty liver disease.

Meet Dr. Hossain


Headshot of Shweta Joshi

Shweta N. Joshi, M.D.

Gastroenterologist

Riverside Gastroenterology Specialists - Williamsburg

Dr. Joshi's medical interests include diagnosing and treating esophageal, stomach, liver, gallbladder, pancreas, small intestine and colon conditions. She also performs gastrointestinal procedures, including endoscopies and colonoscopies.

Meet Dr. Joshi


John Damian Long, M.D.

Gastroenterologist

Riverside Gastroenterology Specialists - Williamsburg
Riverside Gastroenterology Specialists - Gloucester

Dr. Long's medical interests include the diagnosis and treatment of conditions related to the digestive system, including the esophagus, stomach, colon, liver, gallbladder and pancreas. He routinely performs colonoscopies, endoscopies, and other advanced diagnostic and therapeutic procedures.

Meet Dr. Long


Ashan Manohar, MD, FACP, FACG, AGAF

Gastroenterologist

Riverside Gastroenterology Specialists - Eastern Shore

Dr. Manohar's special interests include all common gastrointestinal diseases, inflammatory bowel disease (Crohn's disease and ulcerative colitis), and colon cancer prevention.

Meet Dr. Manohar


Headshot of Celestine Maiki 

Celestine O. Maiki, M.D.

Gastroenterologist

Riverside Gastroenterology Specialists - Hampton
Riverside Gastroenterology Specialists - Newport News

Dr. Maiki's medical interests include the diagnosis of gastroenterology conditions, offering procedures and interventions, including upper endoscopies and colonoscopies.

Meet Dr. Maiki


Headshot of Ashutosh Naniwadekar

Ashutosh Naniwadekar, M.D.

Gastroenterologist

Riverside Gastroenterology Specialists - Hampton

Dr. Naniwadekar's medical interests include the diagnosis and treatment of conditions related to the digestive system, including the esophagus, stomach, colon, liver, gallbladder and pancreas. He routinely performs colonoscopies, endoscopies and other advanced diagnostic and therapeutic procedures.

Meet Dr. Naniwadekar


Michael Ney, M.D.

Gastroenterologist

Riverside Gastroenterology Specialists - Newport News

Dr. Ney's medical interests include autoimmune hepatitis, primary biliary and primary sclerosing cholangitis, hepatitis B & C, hemochromatosis, Alpha-1 antitrypsin deficiency, Wilson’s disease, alcohol-related and non-alcoholic fatty liver disease, and liver transplant patients.

Meet Dr. Ney


Mark A. Titus, M.D.

GI Hospitalist

Dr. Titus's medical interests include the diagnosis and treatment of conditions related to the digestive system, including the esophagus, stomach, colon, liver, gallbladder and pancreas. He routinely performs colonoscopies, endoscopies and other advanced diagnostic and therapeutic procedures.

Meet Dr. Titus


Martha Alejandro-Bird, AGNP-C

Martha Alejandro-Bird, AGNP-C

Nurse Practitioner

Riverside Gastroenterology Specialists - Williamsburg

Mrs. Alejandro-Bird's medical interests include general gastroenterology care, gastric motility issues and colon health.

Meet Martha


L. Jason Bain, FNP-BC

Nurse Practitioner

Riverside Gastroenterology Specialists - Williamsburg

Mr. Bain's medical interests include the diagnosis and treatment of conditions related to the digestive system, including the esophagus, stomach, colon, liver, gallbladder and pancreas.

Meet Jason | Request an Appointment


Elizabeth Breton, NP

Nurse Practitioner

Riverside Gastroenterology Specialists - Newport News

Ms. Breton's medical interests include the diagnosis and treatment of a wide variety of gastrointestinal illness and digestive conditions.

Meet Elizabeth 


Jody Chance, NP

Nurse Practitioner

Riverside Gastroenterology Specialists - Eastern Shore

Ms. Chance's medical interests include the diagnosis and treatment of a wide variety of gastrointestinal illness and digestive conditions.

Meet Jody | Request an Appointment


Michelle R. DiPasquale, AGAC-NP

Nurse Practitioner

Riverside Gastroenterology Specialists - Newport News
Riverside Gastroenterology Specialists - Hampton

Ms. DiPasquale's medical interests include diagnosis and treatment of conditions related to the digestive system, including the esophagus, stomach, colon, gallbladder, liver and pancreas.

Meet Michelle


Shannon L. Dishman, FNP-C

Riverside Gastroenterology Specialists - Williamsburg
Riverside Gastroenterology Specialists - Gloucester

Nurse Practitioner

Mrs. Dishman's medical interests include the diagnosis and treatment of a wide variety of illnesses and digestive conditions.

Meet Shannon


Vera Dovirak, PA

Physician Assistant

Riverside Gastroenterology Specialists - Newport News

Mrs. Dovirak medical interests include nutrition education and promotion, preventive care, such as colonoscopies, weight management, and autoimmune disorders affecting the GI tract.

Meet Vera


Travis J. Dozier, PA

Physician Assistant

Riverside Gastroenterology Specialists - Newport News
Riverside Gastroenterology Specialists - Hampton

Mr. Dozier's medical interests include the diagnosis and treatment of conditions related to the digestive system, including the esophagus, stomach, colon, liver, gallbladder and pancreas.

Meet Travis


Brittany Fields, PA-C

Physician Assistant - hospital only

Ms. Fields's medical interests include the diagnosis and treatment of conditions related to the digestive system, including the esophagus, stomach, colon, liver, gallbladder and pancreas.

Meet Brittany


Marissa Gregoire Headshot

Marissa D. Gregoire, DNP, FNP-BC

Nurse Practitioner

Riverside Gastroenterology Specialists - Hampton

Ms. Gregoire's medical interests include the diagnosis and treatment of conditions related to the digestive system, including the esophagus, stomach, colon, liver, gallbladder and pancreas.

Meet Marissa


Benjamin Ingerson, PA-C

Physician Assistant

Riverside Gastroenterology Specialists - Newport News

Mr. Ingerson's medical interests include the diagnosis and treatment of conditions related to the esophagus, stomach, colon, liver, gallbladder and pancreas.

Meet Benjamin


Headshot of Fariah Ishrat

Fariah Ishrat, PA-C

Physician Assistant

Riverside Gastroenterology Specialists - Hampton

Ms. Ishrat's medical interests include the diagnosis and treatment of acute and chronic conditions related to the esophagus, stomach, colon, liver, gallbladder and pancreas.

Meet Fariah


Headshot of Anne E. Kennedy, FNP 

Anne E. Kennedy, FNP

Nurse Practitioner

Riverside Gastroenterology Specialists - Newport News
Riverside Gastroenterology Specialists - Hampton

Ms. Kennedy's medical interests include the diagnosis and treatment of a wide variety of gastrointestinal illness and digestive conditions.

Meet Anne


Timothy R. Lee, NP

Nurse Practitioner

Riverside Gastroenterology Specialists - Newport News

Mr. Lee's medical interests include the diagnosis and treatment of conditions related to the digestive system, including the esophagus, stomach, colon, liver, gallbladder and pancreas.

Meet Timothy


Brittany J. Morris, FNP

Nurse Practitioner

Riverside Gastroenterology Specialists - Newport News

Ms. Morris's medical interests include the diagnosis and treatment of a wide variety of gastrointestinal illness and digestive conditions.

Meet Brittany


Meaghan E. Nelson, PA-C

Physician Assistant

Riverside Gastroenterology Specialists - Newport News

Mrs. Nelson medical interest include evaluation and treatment of conditions related to the digestive system, including the esophagus,stomach, colon, liver and pancreas and preventative screening for colon cancer.

Meet Meaghan


D. Steven Pearson, FNP

Nurse Practitioner

Riverside Gastroenterology Specialists - Gloucester

Mr. Pearson's medical interests include the diagnosis and treatment of a wide variety of gastrointestinal illness and digestive conditions.

Meet Steven


Paula Pittinger

Paula G. Pittinger, FNP-C

Nurse Practitioner

Riverside Gastroenterology Specialists - Newport News
Riverside Gastroenterology Specialists - Hampton

Ms. Pittinger's medical interests include diagnosis and treatment of gastrointestinal illness and digestive conditions, with a focus on those suffering from acid reflux and gastroparesis.

Meet Paula


Jennifer B. Ross, FNP-C

Nurse Practitioner

Riverside Gastroenterology Specialists - Eastern Shore

Ms. Ross's medical interests include diagnosis and treatment of conditions related to the digestive system, treating Hepatitis C, administering capsule endoscopies, educating patients on chemotherapy regimens and caring for patients in a holistic manner.

Meet Jennifer