Our Founders
Tiffany Duffing, PhD
President
Dr. Tiffany Duffing is a licensed clinical psychologist and U.S. Army Veteran, and she is one of the founders of GI Psychology. Driven by a passion for serving the community, she embraces roles as a clinician, healthcare administrator, and volunteer. Dr. Duffing specializes in evidence-based therapies for children (9+), adolescents, and adults, with a focus on disorders of the gut-brain interaction (DGBI), chronic pain, anxiety, and life transitions.
Dr. Duffing’s approach to patient care centers on individualized treatment plans that recognize each person’s unique strengths and values, all while working toward specific, measurable goals. This philosophy extends to her leadership of the GI Psychology team, where she fosters a goal-oriented, empathetic, and empowering environment. Having personally dealt with IBS, Dr. Duffing brings a deep, personal understanding of the challenges her patients face, which drives her commitment to increasing awareness and expanding access to effective gut-brain therapies.
In addition to her clinical work, Dr. Duffing actively trains providers, educates the community through events and podcasts, and builds strategic partnerships to bring gastro-psychology services to communities nationwide. She is also an Approved Consultant and trainer with the American Society of Clinical Hypnosis (ASCH) and serves as a volunteer Board Member for the Northern Virginia Clinical Psychologists Association (NVCP).
Ali Navidi, PsyD
CEO
Dr. Ali Navidi is a licensed clinical psychologist and one of the founders of GI Psychology. He is also a founding member and past president of the Northern Virginia Society of Clinical Hypnosis (NVSCH). With over ten years of experience, Dr. Navidi has dedicated his career to helping patients with gastrointestinal disorders, chronic pain, and complex medical issues. His clinical work spans children, adolescents, and adults, where he utilizes Clinical Hypnosis, Brief Therapy, and Cognitive Behavioral Therapy (CBT) to provide effective care.
Dr. Navidi has extensive training in brief therapy techniques and clinical hypnosis, having received specialized education through the American Society of Clinical Hypnosis. His deep clinical expertise allows him to lead the training and development of the clinical team at GI Psychology, ensuring consistent high standards of care. Dr. Navidi’s hands-on, collaborative approach with patients is mirrored in his leadership style, where he works closely with the team to drive the overall growth and success of the practice. Passionate about increasing awareness and expanding access to effective gut-brain therapies, Dr. Navidi plays a vital role in the continued development and success of GI Psychology.
Our Leadership
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