Providers

Offering extensive knowledge, valuable experience and impressive credentials.

Thomas “Tommy” Hysler, M.D., MPH, FACOEM

Chief Medical Officer

Thomas “Tommy” Hysler, M.D., MPH, FACOEM, serves as Chief Medical Officer for HASC where he provides strategic oversight of the HASC occupational health centers nationwide and leads the medical providers who support each location. Dr. Hysler earned a Bachelor of Arts degree from Louisiana State University, a Master of Public Health from the University of Texas, and his Doctor of Medicine from Ross University. He completed his residency in Occupational Medicine at the University of Texas. Dr. Hysler is board-certified in Occupational Medicine and is a Fellow of the American College of Occupational and Environmental Medicine (FACOEM).

Dr. Hysler is passionate about advancing occupational health and is committed to delivering unparalleled healthcare resources and services, as well as state-of-the-art health centers to both employees and employers. He serves as Medical Director for multiple contractor and owner/operator organizations and is frequently sought as a subject matter expert in worker health and occupational medicine.

In addition to his leadership role at HASC, Dr. Hysler contributes to industry and occupational health advancement through his roles on the Occupational Medicine Residency Advisory Committee for the University of Texas and National Safety Council’s Wellbeing and Safety Advisory Board. Outside of his professional responsibilities, Dr. Hysler enjoys traveling with his family and playing music as part of his church praise band.

Bill Christian, MD, MS, MPH

Regional Medical Director

Bill Christian, MD, MS, MPH, graduated from Rollins College with a Bachelor of Arts degree, the University of South Florida Morsani College of Medicine with a Master of Science in Medical Science, the University of Massachusetts Amherst School of Public Health and Health Sciences with a Master in Public Health and Ross University School of Medicine with a Doctor of Medicine. Dr. Christian completed his residencies in both Occupational and Environmental Medicine at the University of Texas Health Science Center in Houston and Public Health and General Preventive Medicine at the University of Massachusetts Chan Medical School.

Dr. Christian is passionate about health promotion and worker health, with a strong focus on developing programs that enhance employee well-being and reduce workplace risks. His work includes creating Total Worker Health initiatives and promoting wellness through health screenings and vaccination programs. By combining his expertise in occupational medicine with a deep understanding of public health, Dr. Christian strives to foster safer, healthier work environments that support long-term employee health and productivity.

Todd Hamel, MD, FACOEM, FAAFP

Regional Medical Director

A Native Texan, Dr. Todd Hamel was born and raised in Houston, attending public schools before returning home for medical school. He trained in Family Medicine in Oregon, where he later served on the faculty of the program.

Todd's career transitioned into corporate health in 2010 when he joined Quanta Services as Corporate Medical Director serving the employees and leadership of North America's largest specialty infrastructure construction contractor. He then took on a leadership role at Dow Chemical, initially directing Health and Emergency Medical Services in Freeport, Texas, and subsequently expanding his oversight to all of Texas, including the Deer Park, Texas City, Beaumont, Seadrift, and Houston sites.

Dr. Hamel's approach to medical care is a unique blend of experiences—from his roots as a big city and country doctor to his extensive expertise in industrial medicine. This allows him to effectively deliver optimal health and safety support to our customers' employees, our team members, and our community. As Regional Medical Director, Dr. Hamel will support HASC's numerous locations, overseeing the medical providers in his region.

Brandon K. Myers, PA-C

Physician Assistant

Brandon K. Myers, PA-C is a Physician Assistant with more than 25 years of experience in occupational and industrial medicine, certified by the National Commission on Certification of Physician Assistants. He completed his Physician Assistant training at Charles R. Drew University of Medicine and Science, establishing a strong clinical foundation that he has applied across high-risk, highly regulated work environments. He is also a veteran and has served in the U.S. Public Health Service Commissioned Corps, contributing to federal public health and medical missions. His career includes extensive support of the oil and gas industry, both onshore and offshore, with significant experience in Alaska’s North Slope oil fields and throughout Houston’s oil and petrochemical corridor, as well as work in occupational commercial fishing and maritime operations.

Brandon brings to HASC a strong record for integrating sound clinical judgment helping organizations reduce risk, maintain compliance, and protect workforce health while supporting productivity in some of the most demanding industrial settings.