Theron Liddell, PhD

Meet Theron Liddell, PhD

Theron Liddell, PhD, is a licensed psychologist with CHRISTUS St. Vincent Medical Group in Santa Fe, where he cares for adults and older adults at CHRISTUS St. Vincent Family Medicine Center. He earned his PhD in Counseling Psychology from Arizona State University and later completed a Master of Science in Clinical Psychopharmacology from New Mexico State University. A Dignity Health faculty biography also lists an APA-accredited postdoctoral fellowship in Clinical Psychology at the Edith Nourse Rogers Memorial VA Medical Center in Bedford, Massachusetts. His current work in Santa Fe places behavioral health within a local family medicine setting that serves the Northern New Mexico residency training environment, helping connect psychological care with community-based primary care. 

Career at a Glance

• Licensed psychologist with CHRISTUS St. Vincent Medical Group in Santa Fe, New Mexico. 
• Provides care for Adult 18–65 and Older Adult >65 patients. 
• Holds a PhD from Arizona State University and a Master of Science in Clinical Psychopharmacology from New Mexico State University. 
• Completed an APA-accredited postdoctoral fellowship in Clinical Psychology at the Edith Nourse Rogers Memorial VA Medical Center in Bedford, Massachusetts. 
• Coauthored a 2025 American Family Physician article on counseling around early childhood concerns, reflecting ongoing scholarly contribution in clinical education. 

Clinical Role and Leadership

At CHRISTUS St. Vincent, Dr. Liddell practices psychology within the Santa Fe family medicine setting, bringing evidence-based behavioral health support into an integrated care environment. 

She/He provides specialized care for conditions such as:

• Anxiety 
• Depression 
• Stress-related concerns 
• Trauma 
• Relationship difficulties 
• Sleep troubles 
• Life transitions and adjustment challenges 

What You Can Expect from Care with Theron Liddell, PhD

Dr. Liddell’s style is thoughtful and collaborative, with an emphasis on evidence-based treatment and a supportive environment where patients feel heard, respected, and empowered. That positioning suggests care built around practical strategies, shared decision-making, and a steady focus on meaningful change rather than generic reassurance. 

You can expect:

• A thoughtful, collaborative approach 
• Evidence-based treatment strategies 
• Care designed to help you feel heard 
• Respectful, supportive communication 
• A focus on meaningful, lasting change 

Research, Clinical Insight, and Thought Leadership

Dr. Liddell’s publicly verifiable scholarly work includes coauthoring the 2025 American Family Physician article, “Early Childhood Concerns: Counseling on Sleep Issues, Thumb-Sucking, Picky Eating, School Readiness, and Oral Health.