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Evonne L. Crump (DO – Maryland) is a certified family physician currently serving as the Medical Director for the Concentra
Medical Center in Lanham, Maryland. A majority of the physicals performed in the center are CMV driver physical examinations. Her
duties include performance of pre-employment, return-to-work, and respirator physicals and injury management. Her medical director
responsibilities include staff management, client support, and community education. She is dedicated to the education of medical
students and residents and currently serves as an adjunct professor of family medicine for New York College of Osteopathic Medicine,
as well as a resident preceptor for the National Rehabilitation Hospital. Prior to joining Concentra, Dr. Crump was the primary physician
for an urgent care center where the majority of patients were underserved. As a resident, Dr. Crump was essential in the formation of
programs for the medically underserved. She continues her service to the underserved through a variety of community service volunteer
efforts and education programs. Dr. Crump currently conducts 2,500 CMV driver physical examinations annually.
Teri Gourley (DO – Ohio) is a board certified family physician currently employed by Samaritan Regional Health System, in their
hospital-based occupational medicine clinic, in Ashland, Ohio. As part of her occupational medicine practice, Dr. Gourley manages occupational
injuries and conducts pre-employment physicals, return-to-work physicals and respirator evaluations. She performs work site analysis and helps
coordinate and market health and wellness programs for the hospital’s industrial clients. She lectures and gives presentations to the community
and industrial clients on health and wellness topics and industrial/occupational topics. She also works in the hospital’s Emergency Department
where she evaluates work injuries and other minor emergencies. Dr. Gourley brings a background in managing acute and chronic illness. Prior to
occupational medicine practice, she was a National Health Corps scholar and worked at a community health center. She has completed the American
College of Occupational & Environmental Medicine (ACOEM) Basic Curriculum in Occupational Medicine series and participated in the American College
of Physician Executives: Physicians in Management coursework. Dr. Gourley conducts approximately 300 CMV driver physical examinations annually.
Hetzal Hartley (MD – Virginia) is the medical director of the Carilion Occupational Medicine Program, an occupational medicine clinic serving
more than 400 client companies. Dr. Hartley is also the Medical Director for Carilion Employee Health, an eight-hospital health care system serving
10,000 full-time employees. He works on the Infection Control, Employee Health, and Safety committees for this organization. He received his masters
in public health in occupational medicine in 1998, and is a certified Senior Aviation Medical Examiner as well as a certified Medical Review Officer.
Dr. Hartley has taught for many years and currently serves in a formal capacity as Clinical Assistant Professor of Emergency Medicine at the University
of Virginia School of Medicine as well as adjunct clinical faculty in Family Medicine Residency at Roanoke Memorial Hospital. He has given presentations
on topics such as workers compensation, drug abuse, triage, trauma, toxicology, injury prevention, and industrial, undersea, and aerospace medicine. He
is retired from the United States Air Force Reserve. He flew as a flight surgeon in both Iraq and Afghanistan, logging more than 1,000 hours as a crew
member during his military career. Dr. Hartley conducts 800 CMV driver physical examinations annually.
Karen Horn (APN – California) has specialized in occupational health since 1985, when she began work as a nurse practitioner at Hughes-Lewis
Associates in Oakland, California. For the past eight years, Ms. Horn has worked as a nurse practitioner at Concentra Health Services. Prior to her
work in occupational medicine, Ms. Horn worked in gastrointestinal and infectious disease at Memorial Hospital-Sloan Kettering Cancer Center in New
York, NY. She has a master’s of science in nursing from the University of California, San Francisco. Ms. Horn conducts 500 CMV driver physical
examinations annually.
Vaunzell Linnville (PA – Virginia) currently works at the Prince William Hospital Emergency Department and Occupational Health Clinic. Ms. Linnville
provides urgent and emergent medical treatment for work-related illnesses and injuries, performs patient physical exams including Department of Transportation
(DOT), pre-placement, and return-to-duty examinations, and performs evaluations and screenings for routine, travel, and post-exposure vaccinations and immunizations.
Prior to working at these institutions, Ms. Linnville worked as a physician assistant in the U.S. Air Force at Walson Air Force Family Practice Clinic in Ft. Dix,
New Jersey, where in addition to providing care to more than 44,000 beneficiaries, highlights of her work included managing the Pseudofolliculitis Barbae (PFB) and
Wart Clinics, serving as the medical liaison for episode of care of depression, completing the Medicolegal Death Investigator Training Course, and organizing the
clinic’s first National PA Day. Ms. Linnville also worked as a physician assistant at the family practice clinic on the Los Angeles Air Force Base, where she served
as Assistant Director of the Women’s Health Program, as Supervisor of Minor Surgery Tracking, and as a member of the Infection Control/Patient Assessment Team. Ms.
Linnville has her master’s degree in physician assistant studies in family practice and is certified with special recognition by the National Commission on Certification
of Physician Assistants.
Douglas Martin (MD – Iowa) currently serves as Medical Director for St. Luke’s Occupational Health Services in Sioux City, Iowa, a hospital-affiliated occupational
medicine provider. He has worked in occupational health for his entire career, serving as staff physician or medical director in each prior setting. Dr. Martin has served
in many positions for the American Academy of Disability Evaluation Physicians, including President, Vice President, Treasurer, and Secretary. He currently serves on the
organization’s Board of Directors. In addition, Dr. Martin is the current Medical Review Officer Section Chair for ACOEM. He teaches occupational medicine and medical
review officer courses for ACOEM and the American Academy of Disability Evaluating Physicians (AADEP) and is a guest author for ACOEM’s MRO Update Newsletter. He is board
certified in family medicine and as an independent medical examiner and serves as both a Medical Review Officer and FAA Medical Examiner. Dr. Martin gained experience in
the development and psychometrics of physician certification examinations while serving on the exam committee for AADEP’s certification examination. He conducts 150 CMV
driver physical examinations annually.
Michael Tso (DC – Missouri) serves as President of Dr. Michael Tso, Inc., providing consulting services and conducting CMV driver physical examinations, breath alcohol
and substance abuse testing, physical demand assessment, and workman’s compensation examinations. He is a founding member and current Vice President of HealthBridge, LLC, an
organization that provides evaluation and determination of permanent impairment ratings, as well as the determination of medical causation. He is also an administrator for CMV
examinations for Road Ready, Inc. Dr. Tso has served as a seminar instructor in emergency care procedures. He currently conducts 3,800 CMV driver physical examinations annually.
Karl Wagner, Jr. (PA – Michigan) is the senior physician assistant at Providence Hospital and Medical Centers’ Internal Medicine Department. In addition, he currently
provides physician assistant support at Corporate Health Services in Southfield, Michigan. Mr. Wagner has worked in occupational health, substance abuse, home medical service,
emergency room, and industry medical environments. He has served on the adjunct faculty at the University of Detroit-Mercy in the Physician Assistant Program, as proctor for
the National Commission on Certification of Physician Assistants, Inc., and on the adjunct faculty for Wayne State’s Medical Dietetics Program and Physician Assistant Program.
Mr. Wagner has served as President-elect and President of the American Academy of Physician Assistants in Occupational Medicine and as a member of the Michigan Council on High
Blood Pressure. In addition, he has filled several positions with the Michigan Academy of Physician Assistants, including Fellow, Legislative Committee Member, Board of Directors
Region Six Representative, and Chairman of the Membership Committee. Mr. Wagner has several years of United States Coast Guard experience, including work as a hospital corpsman
and military representative, for which he received a National Defense Medal. Mr. Wagner conducts 300 CMV driver physical examinations annually.
Leah Williams (APN – Michigan) currently works as an advanced practice registered nurse and medical examiner at Drug Screens Plus in Grand Rapids, Michigan. Her
duties include performing pre-placement physicals for local employers and driver certification exams evaluating physical, psychological and emotional qualifications of CMV
drivers while adhering to Federal Motor Safety Administration standards, medical advisory criteria and guidelines to determine driver fitness. She also conducts hearing tests
and trains personnel to perform drug screens and breath alcohol tests in accordance with accepted standards. Prior to this, Ms. Williams worked in an employer-sponsored health
care facility, in a collaborative HMO practice, as a clinical university instructor, in a county health department, in a hospital and medical center, and in a drug rehabilitation
program. She has served as an adjunct instructor in community health nursing at the University of Detroit – Mercy. Ms. Williams is a certified specialist family nurse
practitioner, a certified Occupational Hearing Conservationist, a certified Breath Alcohol Technician, and is certified to conduct Collector Train-the-Trainer training. Ms. Williams
is a member of the American Nurses Association and has served on the March of Dimes Board of Directors and their Health Professional Advisory Committee. Ms. Williams conducts 2,000
CMV driver physical examinations annually.
Jeffrey Wingham (DC – Illinois) received his doctorate of chiropractic from Logan College in 1989. He has owned his own practice in Springfield, Illinois since 2000. At this
multi-specialty pain center, Dr. Wingham employs a physical therapist, a surgeon, and a medical doctor who is board certified in neurology, citing a belief that more comprehensive
choices for care better serve his patients. Dr. Wingham has been DOT-certified for drug and alcohol testing since 2005. He is a certified Breath Alcohol Technician. He has completed
numerous post graduate studies on the efficacy and hands-on application of Federal regulations and guidelines for performing CMV driver physical examinations. He currently conducts
500 CMV driver physical examinations annually.
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