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Leslie Warner, LMSW

Psychotherapist in Brooklyn, NY

Leslie Warner, LMSW

About Leslie Warner LMSW


Leslie Warner is a Licensed Master Social Worker (LMSW) who provides psychotherapy to children, adolescents, adults, older adults, couples, and families. He has experience in both outpatient and community-based mental health settings, providing individual therapy, mental health assessments, treatment planning, family intervention, and crisis support.

Leslie works with clients experiencing anxiety, depression, trauma, life transitions, relationship challenges, behavioral concerns, family conflict, self-esteem issues, and stress related to work, caregiving, and major life changes. His goal is to create a supportive, collaborative environment where clients feel heard, understood, and empowered to make meaningful, lasting changes in their lives.

His therapeutic approach is compassionate, culturally responsive, and strengths-based. Leslie primarily utilizes Cognitive Behavioral Therapy (CBT) while incorporating principles of Choice Theory to help clients better understand the connection between their thoughts, emotions, and behaviors, build healthier coping strategies, and make choices that align with their personal values and goals. As an early-career clinician, he is committed to continually refining his therapeutic approach through ongoing supervision, professional development, and evidence-based practice.

Before entering the field of clinical social work, Leslie spent more than 25 years in global leadership and innovation roles at L'Oréal. Leading multidisciplinary teams across multiple countries strengthened his communication, coaching, problem-solving, and leadership skills—experience that continues to inform his thoughtful, empathetic, and client-centered approach to psychotherapy.

Leslie is passionate about expanding access to quality mental health care, particularly for underserved and marginalized communities. He is committed to partnering with clients as they build resilience, overcome life's challenges, and develop practical tools to improve their overall mental health and well-being.

Age Groups Served: Children, Adolescents, Adults, Older Adults

Areas of Focus: Anxiety, Depression, Trauma, Life Transitions, Relationship Challenges, Family Conflict, Behavioral Concerns, Self-Esteem, Stress Management, Crisis Intervention, Cognitive Behavioral Therapy (CBT), Choice Theory–Informed Therapy

Languages: English