Meet
Our Providers
Led by Brian McCullough, PMHNP-BC, our team brings over 20 years of combined medical experience to the Phoenix, Surprise, and Sun City West communities. We are Board-Certified Psychiatric Mental Health Nurse Practitioners and Therapists dedicated to a holistic approach—treating the whole person, not just the symptoms.
Whether you need ADHD testing, medication management, or support for anxiety and depression, our providers offer compassionate, evidence-based care. We are currently accepting new patients in the North Valley and West Valley.
Brian McCullough
PMHNP-BC
Nathan Porter
PMHNP-BC
Ally Farrell
MFT
Charles Gunder-Heier
PMHNP-BC
Brian
McCullough
(PMHNP-BC)
As the owner of Serene Psychiatry, Brian specializes in treating both Child and Adult ADHD, anxiety, and mood disorders. With a background in nursing leadership and a commitment to patient education, Brian focuses on finding the right medication balance for your lifestyle.
Nathan
Porter
(PMHNP-BC)
Nathan offers a holistic perspective on mental health, focusing on emotional and physical well-being alongside psychiatric care. With over a decade of nursing experience, he provides expert treatment for PTSD, depression, and ADHD to patients in Surprise, Sun City West and Phoenix.
As a board-certified psychiatric nurse practitioner his goal is to provide patients with an accurate diagnosis, treatment plan, and medication management to ensure that each of his patients can have the freedom to live with confidence and enhance their lives. Nathan offers a holistic approach that is focused on an individual’s emotional, physical, and mental well-being. In his spare time Nathan likes to spend time with his family, coach sports for his children, play golf, and any sport that involves a racquet.
Ally
Farrell
(LAMFT)
Ally is a Licensed Associate Marriage and Family Therapist. She is dedicated to helping individuals, couples, and families navigate life’s challenges and enhance their relationships.
Ally holds a Masters degree in Marriage and Family Therapy. With a strong background in systemic therapy, Ally specializes in addressing issues such as communication problems, relational conflicts, anxiety, depression, and life transitions. In her spare time, she enjoys spending time with her two dachshunds, hiking, and baking.
Charles
Gunder-Heier
(PMHNP)
Charles is a dedicated Psychiatric Nurse Practitioner with an extensive background in healthcare, including emergency medicine and surgical services. Drawing from years of front-line clinical experience, Charles brings a comprehensive perspective to mental health care, ensuring that patients receive compassionate, individualized support.
Charles believes in meeting patients where they are, listening deeply to their concerns, and working collaboratively to promote healing and well-being. His goal is to create a safe, supportive environment where patients feel understood and empowered in their care. Outside of practice, Charles enjoys spending quality time with his wife and three children. Together, they love camping, hiking, and exploring the outdoors.