Marc J. Diener, PhD, Licensed Clinical Psychologist

I am a New York State Licensed Psychologist with extensive experience in individual therapy, psychological testing, and consultation services. My practice is built on a foundation of personalized care, offering tailored approaches to address depression, anxiety, relationship difficulties, substance use, and ADHD. With a dual role as a Full Professor in the Clinical Psychology Doctoral Program at Long Island University-Post, I bring academic rigor and clinical expertise to my work. My therapeutic approach emphasizes a supportive relationship to foster personal growth and behavioral change. I utilize integrative, psychodynamic, cognitive, and behavioral therapies to meet individual needs.

With over 15 years of research experience and 35 peer-reviewed presentations, I combine evidence-based practices with compassionate care. My practice offers flexible appointment times, including Sundays, to accommodate diverse schedules. I hold a PhD from Adelphi University's Derner Institute and have completed advanced training at Bellevue Hospital and St. Luke's Roosevelt Hospital Center. My editorial experience as Consulting Editor for multiple journals enhances my ability to provide research consultation services. I am committed to maintaining the highest standards of professional ethics and client confidentiality.