Welcome New DoM Faculty
CARDIOLOGY

Khaing Htwe, MD
Practice Location:
Westwood
Doctor of Medicine:
University of Medicine 1 Yangon, 2012
Residency:
Internal Medicine, One Brooklyn Health System / Kingsbrook Jewish Medical Center, 2020
Fellowship:
Advanced Heart Failure & Transplant Fellowship, University of California, Los Angeles, 2025
Cardiovascular Disease, Michigan State University/McLaren Health Care, 2024
Echocardiography, Boston Medical Center/VA Medical Center West Roxbury, 2021

Ramkumar Venkateswaran, MD
Practice Location:
Thousand Oaks & Simi Valley
Doctor of Medicine:
HarvarHarvard Medical School, 2017
Residency:
Internal Medicine, Brigham and Women's Hospital, 2020
Fellowship:
Clinical Cardiac Electrophysiology, UCSF Division of Cardiology, 2025
Cardiology, UCSF Division of Cardiology, 2023
DERMATOLOGY

Omeed Modiri, MD
Practice Location:
Santa Monica
Doctor of Medicine:
Columbia University Medical Center
Residency:
Internal Medicine, NYC Health and Hospitals/Queens, 2022
Dermatology, UCLA David Geffen School of Medicine, 2025
DIGESTIVE DISEASES

Brian Horwich, MD, MS
Practice Location:
Santa Monica
Doctor of Medicine:
USC - Keck School of Medicine, 2018
Residency:
Internal Medicine, LAC + USC Medical Center, 2021
Fellowship:
Transplant Hepatology, Keck School of Medicine of USC, 2025
Gastroenterology, Icahn School of Medicine at Mount Sinai, 2024

Amanda Jayne Krause, MD
Practice Location:
Westwood
Doctor of Medicine:
Rush Medical College of Rush University, 2018
Residency:
Internal Medicine, McGaw Medical Center of Northwestern University, Feinberg School of Medicine, 2021
Fellowship:
Advanced Esophageal Preceptorship, UC San Diego, 2025
Gastroenterology, UC San Diego School of Medicine, 2024
ENDOCRINOLOGY

Negar Cohen Kahen, MD
Practice Location:
Downtown
Doctor of Medicine:
UCLA David Geffen School of Medicine, 2017
Residency:
Internal Medicine, Olive View UCLA Medical Center, 2020
Fellowship:
Endocrinology, USC/LAC+USC Endocrinology, 2025

Maria De Lourdes Pagan-Mendez, MD
Practice Location:
Westwood
Doctor of Medicine:
University of Puerto Rico School of Medicine
Residency:
New York Presbyterian Hospital
Fellowship:
New York Presbyterian Hospital-Columbia
GERIATRICS

Xinyu Ji, MD
Practice Location:
Santa Monica & Westwood
Doctor of Medicine:
McGill University Faculty of Medicine, 2021
Residency:
Internal Medicine, McGill University Health Center, 2024
Fellowship:
Geriatric Medicine, University of California, Los Angeles, 2025
GIM/HSR - FAMILY MEDICINE

Ramona Vana Bahnam-Lengyel, MD
Practice Location:
Ventrua
Doctor of Medicine:
St George's University School of Medicine, 2016
Residency:
Family Medicine, San Joaquin General Hospital, 2019

Christal M. Clemens, MD
Practice Location:
Palos Verdes
Doctor of Medicine:
Central Michigan University College of Medicine, 2021
Residency:
Family Medicine, UCLA Family Medicine Residency, 2024
Fellowship:
Train New Train (TNT) Primary Care Psychiatry (PCP) Fellowship, University of California Irvine, School of Medicine, 2024

Bryan A. Medina, MD
Practice Location:
Santa Clarita
Doctor of Medicine:
St George's University School of Medicine, 2021
Residency:
Family Medicine, California Hospital Medical Center, 2025
GIM/HSR - HOSPITALISTS

Doctor of Medicine:
Western Michigan University Homer Stryker School of Medicine, 2020
Residency:
Internal Medicine & Pediatrics, UCLA Ronald Reagan Medical Center, 2024

Doctor of Medicine:
Columbia University College of Physicians and Surgeons, 2022
Residency:
Internal Medicine, Yale University School of Medicine, 2025

Doctor of Medicine:
University of Colorado School of Medicine, 2022
Residency:
Internal Medicine, Olive View UCLA Medical Center, 2025

Doctor of Medicine:
Georgetown University School of Medicine, 2022
Residency:
Internal Medicine, UCLA Department of Internal Medicine, 2025

Doctor of Medicine:
University of California, Riverside, 2021
Residency:
Internal Medicine, Olive View-UCLA Medical Center, 2025
General Surgery, Loma Linda University School of Medicine, 2022

Doctor of Medicine:
University of Queensland School of Medicine, 2011
Residency:
Internal Medicine, Virginia Commonwealth University School of Medicine, 2015

Doctor of Medicine:
University of Arizona College of Medicine, 2021
Residency:
Internal Medicine - Pediatrics, UCLA David Geffen School of Medicine, 2025

Doctor of Medicine:
Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, 2022
Residency:
Internal Medicine, University of Michigan, 2025
HEMATOLOGY-ONCOLOGY

Samer Alkassis, MD
Practice Location:
Westwood, Irvine & Leguna Hills
Doctor of Medicine:
Damascus University, 2015
Residency:
Internal Medicine, Wayne State University, 2022
Internal Medicine, Damascus University Faculty of Medicine, 2016

Joseph S. Ryan, MD
Practice Location:
Santa Barbara
Doctor of Medicine:
University of Washington School of Medicine, 2018
Residency:
Internal Medicine, University of California San Diego, 2021
Fellowship:
Hematology & Oncology, Scripps Health System, 2024
INFECTIOUS DISEASES

Rebecca Linfield, MD, MS
Practice Location:
Westwood
Doctor of Medicine:
UCLA David Geffen School of Medicine, 2018
Residency:
Internal Medicine, Stanford University Hospital, 2022
Fellowship:
Infectious Diseases, Stanford University Hospital, 2025
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