Expert Medical Witness & Consultant for Complex Occupational, Environmental & Public Health Litigation
Harvard-trained, triple board-certified physician in Occupational and Environmental Medicine, Public Health and General Preventive Medicine, and Aerospace Medicine. Medical expert work with the Massachusetts Institute of Technology (MIT), the World Health Organization (WHO), the U.S. Navy, and the American College of Occupational and Environmental Medicine (ACOEM).
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As a Co-Founder of Sequoia Port, Inc., he identified the need to provide a simplified experience for reviewing medical records that are inundated with duplicate data, repetitive, blank, and irrelevant pages. He guided product development from concept to launch. He leveraged years of building strong relationships with industry leaders and key stakeholders to forge partnerships focused on helping improve health outcomes and decrease healthcare costs.
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With five other fathers that co-Founded IDefine, they identified the need to create a non-profit organization in the ultra-rare disease space that focuses on the discovery of treatments for the genetic causes of autism and intellectual disability, modeling Kleefstra Syndrome.
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His involvement in the coronavirus (COVID-19) response includes instructing medical, health, and safety professionals, creating policies and procedures, directing preventive medicine and public health, mitigating transmission-risk, managing safe return to work, supervising, cluster outbreak response, contract tracing, and providing primary care and acute care.
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Expert in injuries and illness, including chemical exposures and sensitivities, heat injuries, environmental intolerances, asbestos, dust, mold, air quality, heavy metals (arsenic, cadmium, chromium, copper, lead, nickel, etc), radiation, toxicology, formaldehyde, methyl ethyl ketone, environmental, air pollution, particulate matter, causation, fitness for duty, return to work, malingering, work stress, personal injury, disability, chronic pain, telemedicine, primary care, urgent care, Health Workers, Coronavirus (COVID-19).
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Dr. Harrell is in a committed relationship with his family of four, including two cutie-patootie-captivating-and-insightful-provoking offspring. :)
Services
CHIEF MEDICAL OFFICER & MEDICAL DIRECTOR SERVICES
I serve as a fractional or interim Chief Medical Officer (CMO) and Medical Director for organizations that need experienced medical leadership without a full-time hire.
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I work directly with founders, boards, and executive teams to provide clear clinical strategy, medical governance, and risk-informed decision-making, particularly during periods of growth, transition, or regulatory complexity.
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Services
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Fractional or interim Chief Medical Officer
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Medical Director leadership
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Clinical strategy and governance
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Regulatory and compliance guidance
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Medical risk assessment and mitigation
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Executive-level translation of medical and public health evidence
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Where I Add Value
I am typically engaged when organizations need credible, independent medical leadership that can move quickly and operate at the executive level. My background spans clinical medicine, public health, occupational and environmental health, and policy, allowing me to identify risk early and guide practical, defensible solutions.
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Industries & Focus Areas
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Health technology and digital health
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Occupational and environmental health
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Public and population health initiatives
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Corporate health and workforce risk
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Engagement Model
Engagements may be retainer-based, interim, or project-specific, with clearly defined scope, deliverables, and executive-level communication.
EXPERT WITNESS SERVICES
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I provide independent medical expert witness services in litigation involving occupational, environmental, and public health–related injuries and exposures. I am retained by plaintiff and defense counsel to deliver clear, evidence-based opinions suitable for case strategy, written reports, deposition, and trial.
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My work focuses on medical causation, exposure assessment, standard of care (where applicable), and damages, with careful translation of complex medical and scientific evidence into defensible, jury-understandable conclusions.
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Areas of Expertise
I routinely evaluate and testify in matters involving:
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Injuries and illnesses related to occupational and environmental exposures​
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Chemical exposures and sensitivities
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Toxicology and dose–response assessment
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Heavy metals, including arsenic, cadmium, chromium, copper, lead, and nickel
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Formaldehyde, methyl ethyl ketone (MEK), volatile organic compounds (VOCs), and solvents
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Asbestos, dusts, fibers, and particulate matter
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Radiation exposure
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Environmental and ambient air pollution
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Indoor and occupational environmental conditions
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Mold and moisture-related building claims
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Indoor air quality and ventilation issues
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Environmental intolerances and symptom attribution
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Heat and physical stressors
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Heat illness and exertional heat injury
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Environmental and physiologic intolerance
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Occupational injuries and musculoskeletal conditions
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Acute and cumulative trauma injuries
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Repetitive motion and ergonomic-related disorders
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Work-related aggravation of pre-existing musculoskeletal conditions
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Chronic pain
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Psychological and psychosocial effects of work
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Work stress, exhaustion, and burnout
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Occupational anxiety, depression, and adjustment disorders
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Workplace trauma and post-traumatic stress disorder
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Psychological factors affecting recovery and return to work
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Causation, attribution, and work capacity
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Medical causation and differential diagnosis
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Disability, impairment, and functional limitation
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Evaluation of symptom validity and malingering
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Clinical context
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Personal injury and occupational disease litigation
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Primary care and urgent care–based injury and exposure evaluation
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Health care worker exposures and occupational risk
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Infectious disease–related workplace claims, including Coronavirus (COVID-19)
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Scope of Services
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Case screening and early expert consultation
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Comprehensive medical record review and evidence synthesis
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Written expert reports with clearly articulated methodology
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Deposition preparation and testimony
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Trial testimony
I approach each matter with methodological rigor, independence, and clarity, grounding opinions in peer-reviewed medical literature, accepted occupational health principles, and established public health frameworks.
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Qualifications
I am triple board-certified in Occupational & Environmental Medicine, Public Health & Preventive Medicine, and Aerospace Medicine. I am a Harvard-trained occupational physician, hold a Master of Public Health from Harvard, and serve as a Preceptor at the Harvard T.H. Chan School of Public Health, where I teach physicians in residency training. I have 18 years of clinical experience evaluating occupational injuries, hazardous exposures, and fitness-for-duty and return-to-work issues. I am a Fellow of the American College of Occupational and Environmental Medicine, have held national leadership roles within ACOEM, contributed to practice guidelines, and have published and lectured internationally on occupational and environmental health topics.
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Engagement
Expert witness engagements are accepted on a case-by-case basis, with clearly defined scope, timelines, and fee arrangements. My role is strictly independent and opinion-driven.
Education & Medical Training
2013-2015​
HARVARD
Occupational and Environmental Medicine Residency, 2013-2015
Environmental Health Research Fellow, 2014-2015
Master of Public Health, (MPH) 2014
2009-2010
NAMI, U.S. NAVY AEROSPACE MEDICINE
Flight Surgeon, Winged May 25th, 2010
2008-2009
NMCSD, NAVAL MEDICAL CENTER S.D.
Medical Internship
2008
USU, U.S. MILITARY MEDICAL SCHOOL
Doctor of Medicine (MD)
2003
BYU, BRIGHAM YOUNG UNIVERSITY
Bachelor of Arts in Spanish (BA)
Licensure and Board Certification
Board Certified in Occupational Medicine, American Board of Preventive Medicine
Board Certified in Public Health and General Preventive Medicine, American Board of Preventive Medicine
Board Certified in Aerospace Medicine, American Board of Preventive Medicine
Medical License​: California
Professional Experience

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Chief Medical Officer, WORKCARE, INC., Anaheim, CA
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Co-founder, Chief Medical Officer, SEQUOIA, INC.; Orange County, CA
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Medical Director, SATELLITE HEALTHCARE; San Jose, CA
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Medical Director, WELLNESS SOLUTIONS, INC; Encinitas, CA
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NATO Medical Liaison, Medical Director, Medical Division Officer, U.S. Marine Corps Group Surgeon, Medical Department Head, Flight Surgeon; U.S. NAVY, San Diego, CA
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Co-founder, AMERICAN ANALYTICAL MEDICAL SERVICES, INC.; San Diego, CA
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Trustee, Chair, Delegate, Course Director, and Author; AMERICAN COLLEGE OF OCCUPATIONAL AND ENVIRONMENTAL MEDICINE; Elk Grove, IL
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Co-investigator, FDA approved Clinical Trial, MeRT-TBI-005; UNIFORMED SERVICES UNIVERSITY OF THE HEALTH SCIENCES; San Diego, CA
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Intern / Researcher, Ebola Response Team; WORLD HEALTH ORGANIZATION (WHO), HEADQUARTERS; Geneva, Switzerland GLOBAL OCCUPATIONAL HEALTH, INFECTION PREVENTION AND CONTROL
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Resident, Harvard Occupational & Environmental Medicine; HARVARD SCHOOL OF PUBLIC HEALTH; Boston, MA
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Medical Expert Consultant; MASSACHUSETTS INSTITUTE OF TECHNOLOGY, LINCOLN LABORATORIES; Lexington, MA
Publications
Czarnecki F, Maguire B, Harrell M, et al. Worker Health and Safety in Disaster Response, Disaster Medicine 3rd Edition. Section 2, Chapter 33. March 7, 2023.
Edgar M, Selvaraj S, Lee K, Yohama C, Harrell M, Rodriguez-Morales A. Healthcare workers, epidemic biological risks - recommendations based on the experience with COVID-19 and Ebolavirus. Infez Med. 2022 Jun 1.
Harrell M, Selvaraj S, Edgar M. DANGER! Crisis Health Workers at Risk. The International Journal of Environmental Research and Public Health. July 2020.
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Wizner K, Harrell M, Berenjii M, Gaspar F, Christain J. (2020) Physicians who treat people that work are practicing occupational medicine. J Family Practice. (Accepted April 2020).
Harrell M. Stress Management, Psychological Factors and Workforce Health: Chapter 7, Section 1: The Basic Occupational Health Guide, A Publication of the American College of Occupational and Environmental Medicine Private Practice Section. 2018.
Harrell M. Workplace Violence and Occupational Posttraumatic Stress Disorder, Psychological Factors and Workforce Health: Chapter 7, Section 2: The Basic Occupational Health Guide, A Publication of the American College of Occupational and Environmental Medicine Private Practice Section. 2018.
Harrell M. Benefits of Work, Psychological Factors and Workforce Health: Chapter 7, Section 3: The Basic Occupational Health Guide, A Publication of the American College of Occupational and Environmental Medicine Private Practice Section. 2018.
Harrell M. Delayed Recovery from Injury or Illness, Psychological Factors and Workforce Health: Chapter 7, Section 4: The Basic Occupational Health Guide, A Publication of the American College of Occupational and Environmental Medicine Private Practice Section. 2018.
Harrell M. Contributor to ACOEM Workplace Mental Health Guidelines: Posttraumatic stress disorder and acute stress disorder. American College of Occupational and Environmental Medicine. Effective December 18, 2018.
Saranya A Selvaraj, Karen E Lee, Harrell M., Ivan Ivanov, Benedetta Allegranzi; Infection Rates and Risk Factors for Infection Among Health Workers During Ebola and Marburg Virus Outbreaks: A Systematic Review, The Journal of Infectious Diseases, jiy435. September 7, 2018.
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Bensen S, Harrell,M, Pransky G. Lag Times in Reporting Injuries, Receiving Medical Care, and Missing Work: Associations With the Length of Work Disability in Occupational Back Injuries. Journal of Occupational and Environmental Medicine. Volume 58, Number 1, January 2016. Pages 53 – 60. Jan 2016.
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World Health Organization. Health worker Ebola infections in Guinea, Liberia and Sierra Leone - a preliminary report. Geneva: WHO; 2015.
Lectures & Presentations
"EHR's, I&O Coding, and COVID-19. The COVID-19 Pandemic and Workplace Risks – Incorporating Occupational Data into Infectious Disease Case Reports and EHRs: Recent Progress and Opportunities”
American College of Occupational and Environmental Medicine COVID-19 Webinar Series. August 5, 2020
"COVID-19: DANGER! Crisis Health Workers at Risk”
The 2020 U.S. Army Public Health Course. August 5, 2020
"COVID-19: Best Practices – Telemedicine”
American College of Occupational and Environmental Medicine COVID-19 Webinar Series. April 7, 2020
“COVID-19; Health Workers at Risk: Working During Crises; Historical Lessons Learned.”
28th Annual Joint Safety and Environmental Professional Development Symposium (PDS); Naval Safety and Environmental Training Center. April 9th, 2020
“COVID-19; Workplace Stress, Violence & Occupational PTSD”
28th Annual Joint Safety and Environmental Professional Development Symposium (PDS); Naval Safety and Environmental Training Center. April 6th, 2020
“COVID-19; Benefits of Work and Delayed Recovery”
28th Annual Joint Safety and Environmental Professional Development Symposium (PDS); Naval Safety and Environmental Training Center. April 6th, 2020
“Health Workers Hazards During Crises: The Importance Of Advocating For Health Workers.”
Johns Hopkins Bloomberg School of Public Health. November 18, 2019.
“DANGER! Health Workers at Risk. Working with Refugees, Immigrants, Migrants, Displaced Persons, and Persons in Areas of Conflict.”
Keynote Speaker at the International Commission on Occupational Health’s (ICOH) 11th International Joint Conference on Occupational Health for Health Workers (OHHW). Hamburg, Germany, October 22, 2019.
“Providing Healthcare to Displaced Persons and Displaced Health Workers.” Panel Discussion Member.
International Commission on Occupational Health’s (ICOH) 11th International Joint Conference on Occupational Health for Health Workers (OHHW). Hamburg, Germany, October 22, 2019.
“Common Occupational Musculoskeletal Injuries and Low Back Pain”
U.S. Navy Occupational and Environmental Fundamentals Course. September 10, 2019.
“Work Hazards and Ergonomics 101 For the Health Care Provider”
U.S. Navy Occupational and Environmental Fundamentals Course. September 10, 2019.
“Mental Health in the Work Place; The Bio-psycho-social-economic Model.”
U.S. Navy Occupational and Environmental Fundamentals Course. September 10, 2019.
“Work Disability, Managing Difficult Cases: Stress in the Workplace, Workplace Violence & Occupational PTSD, and The Occupational Biopsychosicaleconomic Model.”
Johns Hopkins Bloomberg School of Public Health. September 9, 2019.
“What is Occupational Medicine.”
U.S. Navy Occupational and Environmental Fundamentals Course. September 9, 2019.
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Endorsements

“I witnessed Dr. Harrell’s enormous determination, discipline, organization and time management to fulfill his tasks in very short deadlines and up to the highest standards. He also demonstrated good interpersonal skills in a challenging multicultural environment...”
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Dr. Ivan Ivanov,
Occupational Health,
World Health Organization (WHO), 2014
“[Dr. Harrell] immediately impressed me as a consummate medical and military professional...He consistently demonstrated the ability to synthesize and integrate ideas from multiple disciplines and to present those thoughts in ways that built common ground among participants representing diverse and sometimes contentious organizations. A skilled discussion leader, he proved invaluable in creatively developing the means of bringing differing positions into alignment.”
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Brigadier General Keith Holcomb (Ret),
Massachusetts Institute of Technology (MIT), 2015



