Occupational and environmental medicine focuses on the interactions between work, health and the environment. Doctors who specialize in this field prevent, evaluate, and manage adverse health effects from work and environmental hazards.  Individuals can be exposed to chemicals, sources of traumatic injury, occupational diseases, and hazardous physical agents in their jobs.  Any of these exposures can cause injury or disease, which can occur immediately or even after years or decades. Understanding these issues and their effects constitutes the core of occupational medicine.

MISSION: REOH specializes in evidence based medical reviews of injuries and illnesses related to work and the environment.
VISION: REOH will be the top source of occupational and environmental health services.

Our Staff


John C. Schumpert, MD, MPH, FACOEM, founded Resources for Environmental and Occupational Health, Inc. (REOH) in 2001 and is Board Certified in Occupational Medicine. He received his Bachelor of Science from the University of Montana, Doctor of Medicine from the University of California, San Diego School of Medicine, and Master of Public Health from the University of Minnesota Graduate School of Public Health, where he also completed his residency in Occupational Medicine. Immediately following residency, Dr. Schumpert held was a staff physician at the corporate headquarters of 3M Company, and was awarded the 3M Chairman’s Leadership Award for his contributions to the Industrial Hygiene Exposure Assessment undertaken at four the 3M specialty chemical plants involved in fluorochemical production. Returning west, Dr. Schumpert then provided direct occupational medicine patient care and medical surveillance services at the Idaho National Laboratory. Upon his return to Montana, he was recruited to serve as medical director for occupational health at Benefis Healthcare in Great Falls, where he provided direct patient care, hospital consultative services, program development expertise, and independent medical evaluations. He has served as a faculty affiliate of the University of Montana Center for Environmental Health Sciences since 2002, and as medical director for the Employment Relations Division of the State of Montana Department of Labor and Industry from 2010-2012 and from 2015 to the present.
Contact Dr. Schumpert at jcs@reoh.com

David J. Hewitt, MD, MPH, DABT, has more than 25 years of experience in the areas of occupational medicine, environmental epidemiology, and toxicology. A native of South Dakota, he received a Bachelor of Science in chemistry from the South Dakota School of Mines and Technology and a Doctor of Medicine from the University of South Dakota School of Medicine. He received a Master of Public Health degree in epidemiology from the San Diego State University Graduate School of Public Health.  Dr. Hewitt completed a residency in preventive medicine and public health with the California Department of Health Services working with the Environmental Health Investigations Branch.  He also completed a residency in Occupational Medicine with the Midwest Center for Occupational and Environmental Health and the University of Minnesota Graduate School of Public Health.  His previous experience has included work as a medical officer with the Agency for Toxic Substances and Disease Registry (ATSDR) where he provided consultation to both medical providers and the general public throughout the U.S. regarding chemical exposures. He has also worked as a private consultant in toxicology and environmental epidemiology.  Dr. Hewitt specializes in analysis of health effects from chemical and environmental exposures with a special interest in respiratory conditions.  He has worked with numerous clients including Fortune 500 companies, universities, public health agencies, and attorneys nationwide as both a testifying and non-testifying expert regarding a wide range of environmental health topics.  Dr. Hewitt is Board Certified in Occupational Medicine, General Preventive Medicine and Public Health, and Toxicology. 
Contact Dr. Hewitt at djh@reoh.com

Margaret Cook-Shimanek, MD, MPH is board certified in Occupational and Environmental Medicine, Public Health, and General Preventive Medicine.  After completing a Bachelor of the Arts in biology at the University of Montana, she went on to receive a Doctor of Medicine from the University of North Dakota School of Medicine and Health Sciences. Dr. Cook-Shimanek completed her Public Health and Preventive Medicine residency training and Occupational and Environmental Medicine residency training from the University of Colorado.  During residency training, Dr. Cook-Shimanek published on a variety of occupational and prevention focused topics: see the list here.  She received her Master of Public Health in epidemiology from the Colorado School of Public Health.  Prior to joining REOH, she worked as a treating occupational medicine physician at Saint Alphonsus Medical Group in Boise, Idaho.  Dr. Cook-Shimanek is a member of the External Advisory Panel for the Colorado School of Public Health Mountain and Plains Education Research Center and previously served on the External Advisory Board for the University of Washington Northwest Center for Occupational Health and Safety.  Dr.  Cook-Shimanek currently oversees the updating of the Montana Utilization and Treatment Guidelines and is Co-Medical  Director for Workers’ Compensation for the State of Montana Department of Labor and Industry.  
Contact Dr. Cook-Shimanek at mcs@reoh.com

In the office:

Anya Vasquez, Administrator, received a double Bachelor of Psychology and Fine Art from the University of Montana and a MBA from Southern New Hampshire University.  Ms. Vasquez oversees all operations of REOH, including human resource management, finances, marketing, project management, and information organization and dissemination.  Her professional background includes experience in the non-profit and for-profit sectors, where she provided financial and human resource management, grant writing and exhibit creation, and event planning and donor relations.
Contact Ms. Vasquez at akv@reoh.com

Anya Vasquez, Administrator


Kate Petterson, Medical Information Specialist, holds a Bachelor’s of Arts in Philosophy/Political Science from the University of Montana and a Master’s of Science in Psychology from the University of Phoenix.  She provides management of all medical records, editing, and customer service for REOH.  Ms. Petterson has a background in journalism and served as secretary of the Board of Missoula Community Access Television for nine years.  
Contact Ms. Petterson with medical records inquires at kip@reoh.com

Lynn Parenteau, Client Services Specialist, graduated from the University of Montana with an Associate of Applied Sciences degree in Food Service Management and a Certificate in Culinary Arts, and is working toward a bachelor's degree in Public Relations.  Her background in customer service and hospitality lends itself well to her position at REOH, where she is the primary point of contact between REOH’s clients and workers compensation claimants. 
Contact Ms. Parenteau to schedule an appointment at ljp@reoh.com

Lynn Parenteau, Client Services Specialist

Leah Morrow, Communications Specialist

Leah Morrow, Communications Specialist, holds a Bachelor’s of Arts in Philosophy from the University of Montana.  Ms. Morrow brings a wide range of expertise and a background in business to REOH.  Her experience in graphic design, website creation and management, and social media continue to grow REOH’s online presence.  Ms. Morrow also assists in the creation and implementation of REOH’s strategic and marketing plans.
Contact Ms. Morrow at lcm@reoh.com

Marie Osborne, Office and Medical Records Assistant, has a Bachelor of Science degree in Sociology from Western New Mexico University. She has gained office administration experience with nonprofit organizations and for profit businesses over the past  30 years.  Previously, Marie co-founded an Arts in Education Advocacy organization which lobbied for arts funding for public schools. Her experience includes development of Board of Directors, grant writing, budgeting, project management, arts presenting and fundraising. She extended this experience as a project manager and provided administrative support to several additional nonprofits in New Mexico.  In Missoula, Marie has held positions at  First United Methodist Church,  Rocky Mountain School of Photography, and  Western Montana Addiction Services, Inc.  
Contact Ms. Osborne at meo@reoh.com

Marie Osborn

Contact Us

Physical address:
210 East Pine Street, Suite 100
Missoula, MT 59802

Mailing address:
P.O. Box 8809
Missoula, MT 59807

Phone: 406.549.6520
Fax: 406.549.6797
Email: info@reoh.com