Doctors

Pediatric Medicine

• 
  Paul C. Hessler, MD – Lead Pediatrician View Bio
  

  Paul C. Hessler, MD – Lead Pediatrician

  Clinical Interests: Newborn and Hospital Medicine

  School: Ponce School of Medicine

  Residency: Children’s Regional Hospital at Cooper

  Joined Whittier Street Health Center on: July 6, 2026

  Languages Spoken: Spanish and Portuguese

  Accepting New Patients: Yes

• 
  Dr. Michael Oanea, Pedi View Bio
  

  Dr. Michael Oanea, Pedi

  Michael Oanea, Pedi
  Clinical Interests: Neurodevelopmental Disabilities
  School: University of Oklahoma
  Residency: Boston Children’s Hospital
  Languages Spoken: English
  Special Interests: Autism; Language Development
  Accepting new Patients: Yes

Adult and Family Medicine

• 
  Douglass Bibuld, MD – Lead Physician View Bio
  

  Douglass Bibuld, MD – Lead Physician

  Clinical Interests: Hypertension, Diabetes, Asthma, Fibromyalgia, Vitamin D deficiency

  School: Baylor College of Medicine

  Residency: Harlem Hospital Center

  Languages Spoken: English

  Special Interests: Health Disparities

• 
  Alyssa Bacay, D.O. View Bio
  

  Alyssa Bacay, D.O.

  Provider Name: Alyssa Bacay

  Clinical Interests: HIV medicine, health equity

  School: University of New England College of Osteopathic Medicine

  Residency: University of Connecticut, Fellowship: Boston Medical Center

  Joined Whittier Street Health Center on: October, 2025

  Languages Spoken: English, Visayan, Tagalog

  Special Interests: Traveling, reading, cooking, baking

  Accepting New Patients: Yes

• 
  Dr. Simon Ball, Podiatrist View Bio
  

  Dr. Simon Ball, Podiatrist

  Dr. Simon Ball
  Clinical Interests: Diabetic Care
  School: Western University Of Health Sciences
  Residency: Brookdale Hospital medical Center
  Joined Whittier Street Health Center on 09/2024
  Languages Spoken: English / Portuguese
  Special Interests: Physical Fitness
  Accepting new Patients: Yes

• 
  VILLARREAL VERDECIA, ARTURO, MD-Lead Physician for Internal Medicine View Bio
  

  VILLARREAL VERDECIA, ARTURO, MD-Lead Physician for Internal Medicine

  • Clinical Interests: Diabetes Mellitus.
  • School: Instituto Superior De Sciencias Medicas Habana
  • Residency: University Of Rochester
  • Special Interests: Substance Abuse Disorders
  • Languages Spoken: English , Spanish
  • Accepting New Patients: Yes
• 
  Robin Mayfield, MD- Physician Family Medicine View Bio
  

  Robin Mayfield, MD- Physician Family Medicine

  • Clinical Interests: Internal medicine / Pediatrics
  • School: Harvard Medicine School
  • Residency: UCSF and Umass
  • Joined Whittier Street Health Center on: September 1, 2020
  • Languages Spoken: English , French
  • Accepting New Patients: Yes
• 
  Joseph M.-S-L.DeMertine, MD, MBA, Lead Physician Wellness Specialist Services View Bio
  

  Joseph M.-S-L.DeMertine, MD, MBA, Lead Physician Wellness Specialist Services

  • Clinical Interests: Infectious Diseases, Heath & Development
  • School: University of Minnesota Medical School
  • Languages Spoken: Haitian, French, Spanish
  • Accepting new Patients: Yes

   

   

• 
  Stephen Wright, MD – Medical Director View Bio
  

  Stephen Wright, MD – Medical Director

  • Clinical Interests: Urgent care, adult medicine
  • School: Tufts University School of Medicine, 1996
  • Residency: University of Illinois – Peoria
  • Joined Whittier Street Health Center in December 2013
  • Languages Spoken: English
  • Special Interests: Clinical research, music
  • Accepting New Patients: Yes

OB/GYN

• 
  Krystyna Constantino, NP View Bio
  

  Krystyna Constantino, NP

  Provider Name: Krystyna Constantino

  Clinical Interests: Women’s Health / OB-GYN

  School: MGH Institute of Health Professions, College of the Holy Cross

  Joined Whittier Street Health Center on: 2025

  Languages Spoken: English, Spanish

  Special Interests: Yoga, Travel, Music

  Accepting New Patients: Yes

• 
  Dr. Raja Sayegh, Lead OB/GYN Physician View Bio
  

  Dr. Raja Sayegh, Lead OB/GYN Physician

  Clinical Interests: General OB/GYN,Infertility,Menopause.
  School: American University of Beirut
  Residency: Tufts Medical Center
  Joined Whittier in 2023
  Languages Spoken: English/Arabic/French
  Special Interests: Travel, Gardening
  Accepting new Patients: Yes

• 
  Amanda Davis, CNM View Bio
  

  Amanda Davis, CNM

  Provider Name: Amanda Davis

  Clinical Interests: Midwifery

  School: Boston University + Columbia University

  Joined Whittier Street Health Center on: 3/2021

  Languages Spoken: Spanish / English

• 
  Tarcia Edmonds-Jehu, CNM View Bio
  

  Tarcia Edmonds-Jehu, CNM

  • Education: Boston University School of Public Health
  • Languages Spoken: English, Spanish
  • Accepting New Patients: yes

Mental Health/ Substance Abuse

• 
  Somkenechukwu Okeke,PMHNP-BC View Bio
  

  Somkenechukwu Okeke,PMHNP-BC

  Provider Name: Somkenechukwu Okeke

  Clinical Interests: Psychiatry

  School: Massachusetts College of Pharmacy and Health Sciences

  Joined Whittier Street Health Center on: 2/9/24

  Languages Spoken: English

  Special Interests: Psychiatry – Adult + Adolescents

  Accepting New Patients: Yes

• 
  Adolfo Flores Fortty, MD View Bio
  

  Adolfo Flores Fortty, MD

  Clinical Interests: Psychiatry

  School: Universidad de Especialidades Espíritu Santo (UEES), School of Medicine Guayaquil, Ecuador

  Residency: Bergen New Bridge Medical Center (BNBMC), Paramus, New Jersey (General psychiatry training)

  Joined Whittier Street Health Center on: July 28th, 2025

  Languages Spoken: English and Spanish

  Special Interests: General adult psychiatry, addiction psychiatry, Spanish-speaking population

  Accepting New Patients: Yes

• 
  Stephenie Jackson Wilson, NP View Bio
  

  Stephenie Jackson Wilson, NP

  • Education: Walden university
  • Languages Spoken: English
  • Special Interests: PMHNP ~ Mental Health
  • Accepting New Patients: yes
• 
  Helenita Hamer, MD View Bio
  

  Helenita Hamer, MD

  • Clinical Interests: General Adult Psychiatry
  • School: Federal University, Rio Grande Brazil
  • Languages Spoken: Portuguese, Spanish
  • Accepting new patients: yes
• 
  Hesham Hamoda, MD View Bio
  

  Hesham Hamoda, MD

  Clinical Interests: Research and practice, child psychiatry

  School: Kuwait University, faculty of medicine, 2003

  Joined Whittier Street Health Center August 2011

  Languages spoken: English

  Special Interests: Exercise, fitness, traveling, music

  Accepting New Patients: Yes

Infectious Disease and Special Populations

• 
  Brian Wong, MD – Lead IDSP Physician View Bio
  

  Brian Wong, MD – Lead IDSP Physician

  • Clinical Interests: Infectious Diseases
  • Education: SUNY Downstate College of Medicine
  • Languages Spoken: English
  • Joined Whittier in Sept 2019
  • Accepting New Patients: yes

PharmMD

• 
  Kripali Patel, PharmMD View Bio
  

  Kripali Patel, PharmMD

  Clinical Interests – Diabetes, Hypertension and Cardiovascula Disease

  Education – MCPHS University

  Languages Spoken – English, Gujarati

  Accepting New Patients – Yes

  Special Interests – Chronic Care Management, Transitions of care

  Joined Whittier Street Health Center on 1/2023

Optometry

• 
  Yanchi Guo, Lead Optometrist View Bio
  

  Yanchi Guo, Lead Optometrist

  Clinical Interests: Optometry
  School: New England College of Optometry
  Residency: n/a
  Joined Whittier Street Health Center on09/23/2024
  Languages Spoken: English /Chinese
  Special Interests: Optometry
  Accepting new Patients: Yes

• 
  Sampson Nosike, OD View Bio
  

  Sampson Nosike, OD

  • Clinical Interests: Comprehensive eye care, refractive surgery
  • School: New England College of Optometry, Boston, 1995
  • Residency: Eye Associates PC
  • Joined Whittier Street Health Center on 2/2001
  • Languages Spoken: English / Ibo / Hausa
  • Special Interests: Special lenses and care, reading
  • Accepting new Patients: Yes