top of page

About Us

John Zajecka, M.D.

Dr. Zajecka is the Principal Investigator at Psychiatric Medicine Associates, LLC and the director of the Treatment and Research Center at Rush University Medical Center. Dr. Zajecka earned his MD at Loyola University Chicago Stritch School of Medicine. After graduating, he completed his internship and psychiatric residency at Rush and has also been in private practice since 1988. He is a recognized authority on psychopharmacological treatment of depression and bipolar disorder, including treatment resistant depression.

Dr. Zajecka has authored numerous publications and conducted over 80 clinical research studies in affective disorders, anxiety disorders, and schizophrenia. He has also researched and published extensively in the areas of treatment-resistant mood disorders, and safety and side effects related to psychotropic medications. He has a special interest in the management of treatment-resistant mood disorders, including long-term outcomes of this population.

Ian Mackey, M.S., PA-C

Ian Mackey, MS, PA-C earned his undergraduate degree in psychology at University of Illinois at Chicago, and his master of science degree in physician assistant practice at Rosalind Franklin University of Medicine and Science in North Chicago, IL.  He is certified by the National Commission on Certification of Physician Assistants and is licensed by the State of Illinois. Mr. Mackey is also certified by the Neuroscience Education Institute as a master psychopharmacologist. He is a fellow of the American Academy of Physician Assistants and the Association of Physician Assistants in Psychiatry.


Ian is a guest lecturer at the Physician Assistant Program at Rush University Medical Center. He is also a physician assistant in private practice and sub-investigator of research for Psychiatric Medicine Associates, LLC.


Ian has been a sub-investigator on many important clinical trials. His work has been published in Advance for Nurse Practitioners and Physician Assistants and he has presented research at American Academy of Physician Assistants annual conference and at New Clinical Drug Evaluation Unit (NCDEU) annual meeting.

bottom of page