Tracey Littrell, BA, DC, DACBR is an assistant professor in the Diagnosis and Radiology Department of Palmer College of Chiropractic in Davenport, Iowa, currently teaching Physical Diagnosis and Clinical Psychology. Dr. Littrell has more than thirteen years of clinical practice and teaching experience. She is a frequent continuing education lecturer for chiropractic colleges and for multiple state, national, and world chiropractic organizations and is an author and lecturer of on-line continuing education programs. Dr. Littrell currently serves as the radiology editor for DCTracts and is a peer reviewer for several journals.