Robert A. Leach, author, clinician, and scientist/practitioner is the Mississippi Delegate to the American Chiropractic Association HOD since 2013 and had served as the alternate previously since 2003. He has served previously as board member for the Mississippi Chiropractic Association, and continues to serve as Chairman of its Committee on Research. He has been the recipient of several awards from the MCA including the Research Award (1986), Clinical Excellence Award (1992), and Pioneer Award (1995). He has served on several ACA committees and most recently the Governance Review Committee in 2016-2017.

Designed to be a primary reference for chiropractic students, this is a concise, scientific survey of chiropractic theories based on current research. Completely restructured for the Fourth Edition, this book focuses on the most current biomedical research on the three phase model of vertebral subluxation complex (V.S.C.). This is a useful reference for students studying for the National Board of Chiropractors Examination Parts II, III, and IV, as well as a post-graduate reference providing information on the chiropractic perspective on health and wellness, nutrition, exercise, psychosocial issues, and case management principles for wellness care. This new text focuses on developing critical thinking among chiropractic students, and includes new contributors and new chapters on principles of statistics and a minimum process for validation of chiropractic theory.

The Chiropractic Theories, have been distributed since 1980. Now in its fourth edition, it is published by Wolters Kluwer—Lippincott, Williams & Wilkins. In addition, he has published or presented several dozen scientific papers from clinical subjects ranging from children with attention deficit hyperactivity to correlates of the flexion/relaxation electromyography test, and from PulStar fixation analysis reliability testing and treatment of infantile colic to public health and wellness issues.