Faculty

Core Faculty

Aisha Rivera Margarin, MD, MS

Program Director, Occupational & Environmental Medicine Residency
Faculty Associate, Environmental Health and Engineering
Johns Hopkins Bloomberg School of Public Health
ariver28@jhu.edu

Originally from Puerto Rico, Dr. Rivera is bilingual and board certified in occupational and general preventive medicine. As Program Director, she is responsible for organizing training and educational experiences, evaluating and mentoring residents and maintaining the residency's ACGME accreditation through a number of reporting and administrative tasks. She serves as a Medical Advisor to the International Association of Fire Fighters through a longstanding relationship between the union and the residency program and is the course director for the Department of Environmental Health and Engineering's Clinical Occupational and Environmental Toxicology Course. As of February 2019, she oversees the growing premed focus area for the Master of Health Sciences offered by the Department of Environmental Health and Engineering. Outside of JHSPH, she maintains various professional relationships including working as a per diem physician with Concentra where she was most recently providing medical director and providing oversight for an onsite clinic, is a credentialed Clinical Peer Reviewer for several private companies, and has been assisting the NYC MTA with reviewing their practices in response to COVID-19 pandemic. ​

Her professional interests include: mentoring students and residents, medical education, firefighter health and safety, healthcare worker health, exploring the link between workplace culture and worker well-being, systems thinking, women in the workplace, vulnerable populations, work as a social determinant of health, workplace policies that promote healthy families, and international occupational health. She is a member of the American College of Occupational and Environmental Medicine and serves on the Presidential Taskforce to Increase OEM Visibility. Her hobbies and interests include dedicating time to faith, family, and friends; eating good food; hearing good comedy; listening to podcasts and Audible books and music; traveling; home décor; and keeping up with current events/news.

Brian S. Schwartz, MD, MS

Deputy Program Director, Occupational and Environmental Medicine Residency
Professor and Associate Chair, Department of Environmental Health and Engineering
Johns Hopkins Bloomberg School of Public Health
bschwar1@jhu.edu; Office: 410-955-4130

Dr. Brian Schwartz is a professor, physician, and environmental epidemiologist investigating a broad range of environmental exposures and diseases, from specific toxicants like lead and other metals, to newer concerns such as the environmental health consequences of climate change, food production, and unconventional natural gas development. Much of his research is part of his work as Director of the Environmental Health Institute at the Geisinger Center for Health Research in Danville, PA. There he has become increasingly interested in using electronic health records for “big data” epidemiology. He and his team have ongoing or developing studies of the built environment and obesity, with particular emphasis on the land use, local food, local physical activity, and social environments; the public health impacts of Marcellus shale development in Pennsylvania; the community health effects of animal feeding operations, including the risk of methicillin-resistant Staphylococcus aureus (MRSA); the built environment, abandoned coal mine lands, and diabetes mellitus progression; the contribution of abandoned mine lands to community health and contextual effects; and evaluating the public health risks of energy scarcity and changing energy choices. As the co-director of the Program on Global Sustainability and Health, we are developing courses and research related to these areas.

He is the principal investigator for a number of grants including the surveillance program of former workers of Los Alamos National Laboratories in New Mexico. Each resident typically has an opportunity to travel and participate in surveillance exams of former workers of Los Alamos and Sandia National Laboratories during their residency experience.

Louis Fazen, PhD, MD, MPH

Assistant Professor, Environmental Health and Engineering
Johns Hopkins Bloomberg School of Public Health
Louis.Fazen@jhmi.edu

Dr. Louis Fazen is a public health researcher and physician board certified in both Internal Medicine and Occupational and Environmental Medicine.  Dr. Fazen completed his residency in the Internal Medicine - Primary Care residency at Yale New Haven Hospital, followed by a fellowship in the Yale Occupational and Environmental Medicine Program.  He subsequently worked as an instructor at the Yale School of Medicine and clinically at the Veteran Affairs Healthcare System of Connecticut through the first two years of the COVID-19 pandemic, during which time he was very active in the development and implementation of information systems for the contact tracing, testing, and vaccination of healthcare workers.  He has recently moved to Johns Hopkins Bloomberg School of Public Health to focus on Occupational Health research, and is particularly interested in the relationship between work stress and organizational structure. 

Dr. Fazen originally completed his PhD in Epidemiology and Public Health at the Yale School of Public Health, where his dissertation focused on quality improvement in the delivery of rural primary care and community health services in western Kenya through public health informatics solutions, including the integration of mobile phone-based clinical decision support systems with centralized electronic medical records.  Dr. Fazen is currently working in collaboration with Paul Landsbergis, PhD, EdD on research of occupational risk factors for work stress, including a mixed methods project to identify sources of work stress among workers who are part of a unique, natural experiment in organizational interventions in New York City, Mayor de Blasio’s Worker Cooperative Business Development Initiative.  Dr. Fazen’s other research interests include evaluation of risk factors for occupational transmission of COVID-19 among healthcare workers, and he is currently involved in work on an observational study of SARS-CoV-2 seroconversion among healthcare workers in Connecticut. 

Michael Sauri, MD, MPH

Medical Director, Occupational Health Consultants
Faculty Associate, Johns Hopkins School of Public Health
msauri@ohcmd.com

Dr. Michael Sauri is the Medical Director of Occupational Health Consultants which services over 130 biomedical research laboratories in the Washington metropolitan area. He serves as a Tropical Medicine consultant in his Travel Advisory and Immunization Clinic. He received his Medical Degree from Loyola University and his Master of Public Health and Tropical Medicine (MPH&TM) from Tulane University. Dr. Sauri is boarded in General Preventive Medicine and Public Health, General Internal Medicine, Tropical Medicine and Occupational Medicine. He received Infectious Diseases Fellowship training in the US Navy and is a specialist in Medical Toxicology. He has authored numerous articles in Chemical/Biological Warfare, Refugee/Displaced Populations, Tropical Diseases, and AIDS. As a medical officer in the USAF and US Army, he was the first physician to be awarded the Defense Superior Service Medal. He is a Lt Col and active pilot in the Civil Air Patrol and serves as their Mid-Atlantic Region Health Service Officer. Dr. Sauri has been selected eleven times in the biannual Washingtonian Physician Poll as one of the Top Physicians in Infectious Diseases, as well as, in Internal Medicine in Washington metropolitan area.

Virginia Weaver, MD, MPH

Associate Professor, Johns Hopkins Bloomberg School of Public Health
Medical Officer & Lead Physician, OSHA Occupational Medicine Resident and Graduate Nurse Internship Rotations
Vweaver1@jhu.edu

Dr. Virginia Weaver is a Medical Officer in the Office of Occupational Medicine and Nursing in the US Occupational Safety and Health Administration. She is the lead physician for the occupational medicine resident and graduate nurse internship programs. She also provides medical support for enforcement and the OSHA medical examination program. She remains an Associate Professor at the Johns Hopkins University Bloomberg School of Public Health (part-time) having been on the faculty since completing the occupational medicine residency and a post-doctoral research fellowship there in 1993. She directed the Occupational and Environmental Medicine Residency from 2006 until 2014.

Dr. Weaver’s research focuses on biological monitoring and occupational and environmental kidney disease, including the current epidemic of CKD of unknown cause in Central America, Sri Lanka, India and elsewhere. Her public health activities focus on occupational health risks for fire fighters and international occupational health. She was a member of the World Trade Center Health Program Scientific/Technical Advisory Committee from 2011-2016 and participated in the determination of cancers that would be compensable under the program. She has served on national research review and advisory panels for the Environmental Protection Agency, the National Institute for Occupational Safety and Health, and the National Institute of Environmental Health Sciences.

A list of additional faculty and preceptors can be found at the residency website: http://www.jhsph.edu/omr/Faculty.html

Preceptor Faculty

Hung K. Cheung, MD, MPH
President and Founder of Cogency Medical
Hung Cheung, MD, MPH, has led hundreds of environmental and toxicological investigations, protecting thousands of occupants and saving organizations millions of dollars. A former Maryland State Medical Director and current Fellow of the American College and Environmental Medicine, he is nationally-recognized as an expert in Respiratory Environmental Medicine, Plant and Indoor Environmental Quality, Risk Communication and Medical Advisory Services. Board Certified in both Internal Medicine and Preventive Medicine, he holds a Masters in Public Health from Johns Hopkins and has a medical degree from the University of Maryland. Cheung currently serves on the Advisory Panel for the Johns Hopkins Bloomberg School of Hygiene and Public Health Department of Environmental Health Sciences for their summer institute and Board of Directors for Healthy Housing Solutions, Inc.

Marianne Cloeren, MD, MPH
Associate Professor, Occupational Health Program, University of Maryland School of Medicine 
Clinical and research interests include the care of patients with work-related or environmental-related illness and the biopsychosocioeconomic risk factors for prolonged work disability, the content and quality of physician/patient communication, return-to-work and workers’ compensation policy , and clinical education. She leads a long-term national task force addressing the quality of care in workers’ compensation, by focusing on changing the paradigm for documenting and coding clinical encounters to focus on functional outcomes and risk for prolonged disability.

Sacha H. Gutierrez, MD, MS
Chief Medical Officer, Occupational Health Services, U.S. Food and Drug Administration
Sacha Gutierrez, MD, MS, graduated from Princeton University with a degree in chemistry. She completed medical school at the New Jersey Medical School and then served 3 years on active duty as an Army flight surgeon. Her time in service included one tour in Afghanistan in support of Operation Enduring Freedom. Sacha completed her residency training in occupational medicine at University of Texas at Tyler while also earning a Master’s degree in Environmental Medicine at Stephen F. Austin State University. Previous to joining the staff at FDA in January 2016, Gutierrez worked for the US Army as a disability evaluation physician for five years and then moved on to manage a 24 hour urgent care and occupational health clinic for Concentra, a national healthcare company. Gutierrez lives in Baltimore, Maryland with her husband Patrick, 2 daughters, Alivia and Estelle, aged 11 and 8, their dog Winter, their leopard gecko Autumn, and four chickens.

Robert Lavin, MD
Assistant Professor, Rehabilitation Division, Department of Neurology, University of Maryland Medical Center
Director, Chronic Pain Management Service, VA Maryland Health Care System
Interests as a physiatrist include neurological and musculoskeletal issues of occupational medicine, orthopaedic rehabilitation, spinal injection procedures, electrodiagnosis, and pain management. He primarily sees patients with neck, back, and neuropathic pain, and musculoskeletal (repetitive use) syndromes.

Olusola Malomo, MD, MPH
Medical Director, DC Police and Fire Clinic
Olusola Malomo, MD, MPH, oversees provision of occupational and preventive medical services to the District's more than 6,000 police officers, fire fighters, US Park Police officers and U.S. Secret Service agents.

Stephan Mann MD, MPH​
Medical Director, Corporate Occupational Health Solutions
Stephan Mann, MD, MPH, is Board Certified in Occupational Medicine and Family Practice, and is a certified Medical Review Officer, Independent Medical Examiner and Aviation Medical Examiner. He has practiced medicine for over 30 years and has 20 years of experience in Occupational Medicine.

Melissa McDiarmid, MD, MPH
Professor and Director, Occupational Health Program, University of Maryland School of Medicine
Interests include healthcare workers, metals and clinical toxicology, occupational reproductive toxicants, occupational exposure to hazardous drugs, and depleted uranium toxicity.

Noah Raizman, MD, MFA
Hand, Upper Extremity and Peripheral Nerve Surgery, The Centers for Advanced Orthopaedics
Noah Raizman, MD, MPH, is a practicing hand and upper extremity surgeon with a strong interest in Independent Medical Evaluations and managing occupational injuries. He is a member of the AMA Guides Editorial Panel and a hand and upper extremity surgeon at The Centers for Advanced Orthopaedics in Washington, D.C. and is on the faculty at George Washington University. Raizman speaks nationally on Impairment Rating and has chaired and taught multiple courses for the American Society for Surgery of the Hand (ASSH) on worker’s compensation and impairment rating utilizing multiple versions of the AMA Guides. He also serves as chair of the Evidence Based Practice Committee of the American Society for Surgery of the Hand (ASSH) and is a member of the Evidence Based Quality and Value Committee of the American Academy of Orthopaedic Surgeons.

Michael Sauri, MD, MPH​
Medical Director, Occupational Health Consultants
Michael Sauri, MD, MPH, is the Medical Director of Occupational Health Consultants which services over 130 biomedical research laboratories in the Washington metropolitan area. He serves as a Tropical Medicine consultant in his Travel Advisory and Immunization Clinic. He received his Medical Degree from Loyola University and his Master of Public Health and Tropical Medicine (MPH&TM) from Tulane University. Dr. Sauri is boarded in General Preventive Medicine and Public Health, General Internal Medicine, Tropical Medicine and Occupational Medicine. He received Infectious Diseases Fellowship training in the US Navy and is a specialist in Medical Toxicology. He has authored numerous articles in Chemical/Biological Warfare, Refugee/Displaced Populations, Tropical Diseases, and AIDS. As a medical officer in the USAF and US Army, he was the first physician to be awarded the Defense Superior Service Medal. He is a Lt Col and active pilot in the Civil Air Patrol and serves as their Mid-Atlantic Region Health Service Officer. Dr. Sauri has been selected eleven times in the biannual Washingtonian Physician Poll as one of the Top Physicians in Infectious Diseases, as well as, in Internal Medicine in Washington metropolitan area.