Melissa Callahan, ARNP is a Psychiatric Mental Health Nurse Practitioner with 25+ years of experience diagnosing, treating, and following patients across the adult through geriatric lifespan. She has built her career in both outpatient and inpatient settings with specializations in addiction, behavioral health medicine, and geriatric medicine.

In addition to her clinical work, Melissa has held dual-role positions on executive teams, excelling in administrative and corporate leadership for more than two decades. Over the last seven years, she led her privately owned nurse practitioner practice as chief executive officer, focused on behavioral health care. Previously, she served 10 years as chief nursing officer for a large behavioral health organization.

Melissa has also contracted or worked within multiple health systems — including the VA Health System — for over 20 years. She recently completed a psychiatric mental health nurse practitioner certification across the lifespan. Her long-term goal is to expand access to high-quality psychiatric and mental health care for individuals of all ages through collaborative, evidence-based, and continuity-focused treatment.