Dr. McCahill received her Bachelor of Science degree from the University of Maryland, awarded Magna cum Laude, Phi Beta Kappa, and her Doctor of Medicine (M.D.) degree from the University of Maryland School of Medicine. She completed Residency training in Family Medicine at Fairview General Hospital in Cleveland, Ohio, and Residency training in Psychiatry at UCSD School of Medicine, La Jolla, California. Dr. McCahill is Medical Specialty Board Certified in both Family Medicine and Psychiatry, and she practices both specialties.

Areas of interest: Dr. McCahill has taught courses in psychopharmacology for non- psychiatrists since 2002. Until April 2009, Dr. McCahill served as the Medical Director of St. Vincent de Paul Village in San Diego for over 10 years, where she founded and directed one of the first Combined Family Medicine-Psychiatry Residency Training Programs in the country, and where she developed multi- disciplinary team training at St. Vincent that included trainees in medicine, nursing, social work, clinical psychology, substance abuse treatment counselors, and student chaplains, working together in team training and practice. Dr. McCahill was a full time Professor of Family Medicine and Psychiatry at UCSD School of Medicine for over 15 years, and currently holds a volunteer faculty appointment at UCSD in both specialties, where she continues teaching physicians and health care professionals enrolled in several fields of study.

In addition to the practice of General Adult Psychiatry and the practice of Family Medicine, Dr. McCahill has completed a Graduate Certificate Program in Spirituality and Health Care from George Washington University School of Medicine, and she teaches health care professionals in courses about the interface between spirituality and health.  In 2016, Dr. McCahill was awarded a Master of Theological Studies (MTS) degree from the Franciscan School of Theology, which is affiliated with the University of San Diego.

Dr. McCahill has authored or co-authored 20 scientific, peer-reviewed articles and book chapters, co-authored two books, and she has received numerous awards (including statewide and national recognition) for teaching and for community service. For her work at St. Vincent de Paul Village, Dr. McCahill received the prestigious Medical Board of California Physician Humanitarian Award in 2008.