William D. McDonald, PhD. is a Board Certified Psychologist. He received his PhD. in clinical psychology at the Auburn University in Auburn, Alabama in 1987. He established his private practice in Huntsville in 1990. In 1984, he published a document in the Journal of Clinical Psychology.

William D. McDonald, PhD. joined Medical Affiliated Research Center in 1998 as Sub-Investigator of Psychology. Since 1998, he has been involved in over ten clinical research trials, including a depression and erectile dysfunction trial and numerous female sexual arousal disorder trials.