Business Details
Your Trusted Partner for Psychological Services and Research Consultation
As a New York State Licensed Psychologist and Full Professor in the Clinical Psychology Doctoral Program at Long Island University-Post, I bring over 15 years of expertise in clinical practice, research, and education. My practice focuses on individual therapy and psychological testing for adolescents and adults, addressing concerns such as depression, anxiety, relationship difficulties, and ADHD. I also specialize in consultation services for statistics, research methods, and academic writing. With a career spanning private practice in Washington, DC, and academic roles, I have conducted extensive research, published widely, and presented at national and international conferences. My approach emphasizes a supportive therapeutic relationship, personalized treatment plans, and evidence-based methodologies tailored to each client's unique needs.I hold a PhD from Adelphi University's Derner Institute, completed postdoctoral training at Columbia University-affiliated institutions, and maintain active involvement in professional editorial and review activities. My commitment to excellence is reflected in awards such as the American Psychological Association's Fellow designation and multiple Excellence in Research Awards. I offer flexible appointment times, including Sundays, and maintain offices in Cedarhurst, NY, with a focus on accessibility and client-centered care.
Services
Individual Therapy
Psychological Testing
Statistics Consultation
Research Methods Support
Academic Writing Editing
Highlights and features
- We offer 15+ years of clinical and academic expertise in psychology.
- Our practice combines evidence-based therapy with personalized treatment plans.
- We provide specialized psychological testing for learning and behavioral disorders.
- Our team includes a Full Professor with extensive research publication experience.
- We maintain active professional involvement through journal editorial roles.
Services
Individual Therapy
Personalized mental health treatment for teenagers and adults addressing depression, anxiety, relationship issues, and substance use. Utilizes integrative, psychodynamic, cognitive, and behavioral therapies to foster self-understanding and positive change through evidence-based techniques and a supportive therapeutic relationship.
Psychological Testing
Comprehensive evaluations for learning disorders, ADHD, and emotional/behavioral concerns across all ages. Provides diagnostic clarification through standardized testing protocols and personality assessments to inform treatment planning and educational accommodations.
Statistics Consultation
Expert guidance in statistical analysis for research projects using SPSS, R, and specialized software. Includes study design consultation, database setup, results interpretation, and writing support for academic publications and grant applications.
Research Methods Support
Methodological consultation for developing rigorous research protocols, selecting appropriate study designs, and refining research questions. Combines academic expertise with practical implementation strategies for academic, clinical, and professional research projects.
Academic Writing Editing
Professional editing services for academic writing including dissertations, journal manuscripts, and research proposals. Focuses on clarity, structure, and adherence to publication standards with expertise in psychological and social science content.
People
Marc J. Diener, PhD, Licensed Clinical Psychologist
Licensed Psychologist & Professor
New York State Licensed Psychologist with 15+ years of clinical and academic experience. Full Professor at Long Island University-Post, specializing in psychotherapy research, psychological assessment, and statistical methodology. Published 10 peer-reviewed articles and 6 book chapters.
Questions
What therapeutic approaches do you use?
I utilize integrative, psychodynamic, cognitive-behavioral, and behavioral therapies tailored to individual client needs.
Do you offer psychological testing for adults?
Yes, I provide comprehensive assessments for adults including personality evaluation and diagnostic clarification.
What research consultation services are available?
I offer statistical analysis, study design consultation, and academic writing support for research projects.
Are weekend appointments available?
Yes, I offer Sunday appointments for client convenience.
What academic credentials do you hold?
I have a PhD in Clinical Psychology from Adelphi University and completed postdoctoral training at Columbia-affiliated institutions.
How do you ensure confidentiality?
All sessions and communications maintain strict confidentiality following professional ethical guidelines.
