Mark Sisti, PhD Director & Founder

Mark Sisti, PhD is the founder and director of NYC Cognitive Behavioral, PLLC. He is a graduate of Hofstra University, a licensed psychologist and a adjunct professor at Yeshiva— Ferkauf University, Department of Clinical Psychology. Dr. Sisti is a Diplomat, Certified Cognitive Therapist & Trainer within The Academy of Cognitive Therapy. He is also a peer-reviewed trainer in a more contemporary experiential CBT called Acceptance and Commitment Therapy (ACT).  His advanced training in cognitive therapy was under the tutelage of CBT master clinician, Robert Leahy, Ph.D., at The American Institute for Cognitive Therapy, where Dr. Sisti was formerly the Associate Director.

Dr. Sisti has extensive experience with anxiety disorders through his work at Freedom From Fear, a nationally recognized anxiety and mood disorder advocacy organization, where he was formerly the Director of Cognitive Therapy and where he also participated as a Certified Cognitive Therapist in research trials for N.Y.S. Psychiatric Institute & Columbia Presbyterian. He has also supervised doctoral interns from both Yeshiva-Ferkauf and Hofstra Universities and is a volunteer adjunct clinical supervisor for Yeshiva University Graduate School of Psychology. He trains various mental health experts and professionals in CBT, mindfulness based CBTs, such as ACT, and  has presented trainings and symposia for the American Psychiatric Association, the American Psychological Association, Association for Contextual Behavior Therapy and Suffolk County Psych Assoc.  He has also given numerous seminars and trainings on ACT and other mindfulness based CBTs. Dr. Sisti is also a published author on cognitive therapy, mindfulness, ACT, and Compassion Based Therapy, and Functional Analytic Therapy (FAP).

As a committed life long learner, and in an ongoing effort to keep up with state of the art CBT and its newest developments, he has committed himself and his staff to ongoing supervision and training in, “third generation” CBTs and mindfulness informed CBT, e.g., DBT, FAP, Compassion Informed Therapy and ACT.  He has extensive training and experience with ACT through its founders and leaders, Dr. Steven Hayes & Kelly Wilson. Additional ACT experience comes through being a past president of the NYC chapter of ACBS (Association of Contextual Behavioral Science) ACBS-NYC, and founder of Long Island ACBS, a local ACT affiliate, ACT training and peer study group. He has also trained repeatedly with master third generation clinicians such as; (DBT)Dr. Marsha Linehan & Compassion Focused Therapists (Dennis Tirch, Tara Brach & Christine Neff/Chris Germer). He has also trained and given trainings in “interpersonal” CBTs such as FAP with Drs. Mavis Tsai & Bob Kohlenberg, along with completing a one year relational psychoanalytic training at the Mitchell Institute for Relational Psychoanalysis. He is also founder & president of The “Long Island-CBT Network (”, a LI based professional CBT/EBP networking & dissemination organization as well as being on the board of Suffolk County Psych Association.  Dr Sisti, also incorporates the mindfulness insights he has garnered as a life long practitioner of TM (Transcendental Meditation), Ashtanga Yoga, and Aikido 1st Dan into his life and work.


Maria Steblai, Psy.D. Staff Therapist

Maria Steblai, PsyD., is a senior founding member of NYC Cognitive Behavioral beginning in 2004. Dr. Steblai’s long tenure at our center has made many patients and their families consider her a life long mental health resource. She obtained her doctorate from Hofstra University, where she graduated Phi Beta Kappa. Dr. Steblai obtained her initial clinical training in cognitive-behavioral therapy at Hofstra University.

Her clinical experience at North Shore University Hospital has given her invaluable expertise working with the most intense of crises in peoples lives and the opportunity to work as a team with medical/psychiatric professionals. Additionally her ongoing experience working as a certified school psychologist within several Long Island School districts, gives her broad experience with both children, adolescents, adults and families. We are very fortunate to have a professional with this much experience with childhood and adolescent disorders on staff. Her specialties include, cognitive-behavioral Therapy, ADHD, eating & body image disorders, and children-adolescent disorders. She has presented her research at psychological conventions on; attention & hyperactivity disorders (ADD & ADHD), eating disorders and body image disorders. She regularly conducts groups, workshops and seminars on ADHD, eating disorders and adolescent trauma.


Sarah Levinson, LMSW, Esq.Staff Therapist

Sarah Levinson received her MSW at SUNY Buffalo and her JD from Columbia University School of Law. Sarah specializes in culturally aware sexuality and relationship dynamics across a wide variety of relationship structures, with extensive experience in consensual non-monogamy (CNM). Her work focuses on communication, intimacy, sexuality, kink, consent and infertility for individuals, couples and moresomes.

Sarah led monthly women’s CNM discussion groups for ten years in NYC.  Sarah has also created and facilitated various workshops, panel discussions and podcasts on consent, sexuality and CNM. She works with adults of all ages and adolescents, and is experienced with local CNM, kink, lesbian, gay, bisexual, transgender, asexual and neurodivergent communities. Sarah has extensive training through the Institute of Contemporary Psychotherapy in both the sex therapy (STP) and gender and sexuality (PCGS) divisions.

Sarah has developed a specialty in ACT and CBT for anxiety (panic, trauma, social anxiety, agoraphobia, OCD, BDD, body image and eating disorders) and mood challenges. Sarah’s expertise in ERP and exposure/experiential based CBT/ACT is particularly relevant for anxiety disorders that have not responded to conventional intellectually based interventions and traditional talk therapies.

Sarah also has career counseling expertise from her prior career as an attorney and legal recruiter, with a focus on professional decisions and transitions, office politics and executive-level management strategy. She understands difficult personalities, high stress environments and hierarchical power dynamics.

Sarah’s passions include knitting, burning man, backpacking and kundalini yoga.


Jenna Brick, LMSW – Staff Therapist

Jenna Brick received her MSW in 2018 from Texas State University and is currently an LMSW and New York State Certified Social Worker. Jenna enhances her clinical experience as a Cognitive-Behavioral Therapist with her background in Solution-Focused and Mindfulness-Based Therapy traditions. Working with families and communities, Jenna helps patients to understand the various systems that can affect the individuals and families with whom she is working. While working with individuals across all ages, her background as a school social worker makes Jenna an expert in applying these approaches to children and adolescents. Additionally, Jenna is a certified Children’s Kidding Around Yoga Instructor, Mental Health First Aid Instructor and has regularly conducted psychoeducational groups.

Jenna brings a humanistic focus to her work, by empowering clients to honor their strengths, collaborate more effectively with others and harness specific cognitive behavioral skills to enhance their quality of life. Her approach has been shaped by working in urban environments with adolescents, young adults and families. Jenna is interested in fostering diversity and justice by providing equal opportunities to support the social, emotional and overall well-being of her clients.

Her specialties include: Depressive Disorders, Anxiety Disorders, Trauma and Stressor-Related Disorders and Disruptive, Impulse-Control and Conduct Disorders, ADHD, as well as more general difficulties with life transitions anfamilial and relationship stress.


Michelle Schecter, LMSW Staff Therapist

Michelle earned her Master in Social Work (MSW) from NYU Silver School of Social Work. She previously earned her JD from NYU School of Law. Michelle brings many years of social and emotional intelligence from her first career as a lawyer representing domestic violence survivors. Her experience serving this population gave her many opportunities to witness the transformative power of therapy. This background inspired Michelle to take a special interest in PTSD. Michelle’s interests and experience working with trauma have also heightened the importance of providing a therapeutic space where clients feel safe to explore a wide range of human experiences of loneliness, social anxiety, mistrust, violation, panic, anxiety, depression, grief, anger and shame. Michelle has witnessed the extraordinary resilience that each of us contain. She builds on that resilience with both traditional psychodynamic and modern third generation CBT skills to begin the work of generating positive and lasting change.

Her training at a NYC psychoanalytic institute, and in private practice as a psychotherapist, has given Michelle the opportunity to work with clients facing myriad of life stressors; medical illness, psychiatric diagnosis (social phobia, Panic, OCD, PTSD, major depression), substance use, and also to relational issues, ie., divorce, LGBTQ+ traumas/stressors, coming out, death of a loved one, relationship conflict. In addition to her experience with adults, Michelle has also worked in an inner city agency with teens and young adults struggling with acute anxiety and depression.

Her professional journey as a therapist has also inspired a keen interest in third generation CBT and ACT (Acceptance and Commitment Therapy). Michelle has been honing these modern approaches to therapy via ongoing training with a multitude of trainers, workshops, conferences, case conferences, and a rich array of senior supervisors and trainers. Michelle’s primary goal is to provide a nurturing environment free of judgment, and rooted in empathy, where the client feels heard and empowered. She believes learning to listen non-judgmentally to each other and to ourselves and learning to listen with acceptance and compassion, are key ACT and CBT skills which can help us to navigate even the biggest challenges in our relationships within ourselves.


Rebecca Klouwers Office Manager

Rebecca is the office manager and is an expert problem solver, working to ensure that everything runs smoothly from billing and bookkeeping to insurance filing. If you have any sort of question or problem with logistics, you’ll likely be referred to Rebecca and she’ll be more than happy to solve your issue and support you in any way she can! Rebecca loves helping others and will be glad to assist you. Rebecca has a BFA from New York University in Theatre and Child and Adolescent Mental Studies. In addition to helping at NYC Cognitive Behavioral, she also is an executive and personal assistant for a number of other clients.

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