“Always remember people who have helped you along the way, and don’t forget to lift someone up.” - Roy T. Bennett



David L. Henderson, MD

Board Certified Psychiatrist

Dr. David Henderson is a board certified psychiatrist, author and speaker. He is the founder and president of Four Stones Collaborative, a mental health consulting group in Dallas, Texas. He sees adolescent and adult clients with a wide range of psychiatric disorders including depression, anxiety, bipolar disorder, obsessive compulsive disorder, delusional disorders, and substance abuse. Prior to starting Four Stones, Dr. Henderson partnered with an organization called Southwest Clinical and Forensics, where he offered a number of services including psychiatric medication management, individual and family counseling, and expert witness testimony in family, civil, and criminal matters for the Dallas and surrounding county courts.

For five years, Dr. Henderson served as the Department Chair of Psychology and Counseling at Criswell College, rebuilding its Masters in Counseling Program and starting the undergraduate major in Psychology. He also helped to develop a fully online counseling curriculum for the school. In addition, Dr. Henderson has served as an adjunct professor of Psychology and Counseling at Dallas Theological Seminary. Currently a member of the board of directors for Drug Prevention Resources, Inc. (a nonprofit organization dedicated to preventing youth substance abuse) and Mental Health America of Greater Dallas (a nonprofit organization working to promote mental wellness through community education and policy advocacy), he has also been a correspondent for various media outlets including Newsweek, NBC, CBS 11, FOX 4, CW33, WFAA, and KCBI.

Dr. Henderson has presented nationally and internationally at conferences for the American Psychiatric Association, the American Academy of Psychiatry and the Law, The Christian Association for Psychological Studies, and the Christian Medical and Dental Association. He is the author of two books, Finding Purpose Beyond Our Pain: Uncover the Hidden Potential in Life’s Most Common Struggles and My Teenage Zombie: Resurrecting the Undead Adolescent in Your Home.

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Natalia (Natasha) Joseph, MBS, LPC

Licensed Professional Counselor

Natalia (Natasha Joseph) received her Bachelor of Arts in Psychology from Austin College. During her academic studies she volunteered at the local fire department and was instrumental in establishing a Trauma Intervention Program through Austin College to assist first responders with psychological assessments. Natalia earned a Master's degree in Behavioral Studies from Southeastern Oklahoma State University and joined the Center for Psychological Development as an LPC intern. Once fully licensed, she specialized in individual and family counseling and neuropsychological testing. During her tenure, she had multiple opportunities to utilize the knowledge of her native language, helping adopted children from Russia and the Ukraine to assimilate into their new families. She also helped guide new parents through the emotionally challenging parts of the process. In addition to her other areas of focus, she has experience with forensic psychological evaluations and pre-op assessments for clients seeking elective surgical procedures.

Natalia is actively involved in the community and serves as a Sunday School Coordinator in a local church.

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Alan Johnson, PsyD

Licensed Psychologist

Dr. Alan Johnson is a licensed psychologist in the state of Texas. He earned his bachelor’s degree in psychology from Michigan State University in 2009 and his master’s and doctoral degrees in clinical psychology from The Chicago School of Professional Psychology in 2011 and 2014, respectively. He has received training and been employed in a variety of clinical settings, which have included residential treatment centers (RTCs), intensive outpatient programs (IOPs), university counseling centers, private practices, and nursing homes. His primary specialties include gender, sexual, and romantic minorities (GSRM), addiction and recovery, concerns related to eating, weight, and size (CREWS), and psychological evaluations.

Through an integrative approach utilizing humanistic-existential, cognitive-behavioral, and psychodynamic theories as well as other therapeutic techniques, Dr. Johnson’s goal is to create a safe and accepting environment that allows clients to achieve their goals based upon the foundations of embracing diversity, promoting change, and fostering authenticity. Through research, presentations, and involvement with nonprofit organizations, he is committed to reducing stigma associated with mental health, identifying as a gender, sexual, and/or romantic minority, and HIV/AIDS.

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Gail York, LMHC, MA, NCC

Licensed Professional Counselor

Gail York is an experienced psychotherapist with a passion to connect with individuals and help them to discover strengths within themselves to better navigate the complexities of modern life. She is a nurturing nonjudgmental therapist who believes in enriching relationships, instilling hope and imparting necessary life skills and coping strategies to help people succeed through difficult and sometimes painful transitions. Her aim is to assist you on your journey to healing and living the best life possible.

Gail has an undergraduate degree in Sociology and Psychology from the University of Florida. She completed her Masters in Mental health Counseling and Marriage and Family Therapy at Rollins College. Her Master's level clinical practicum was completed at The Center for Drug Free Living in the Residential Women's Treatment Facility and her Master's clinical internship at Seminole Community Mental Health Center where she worked with patients in the hospital, as well as outpatient as a Crisis Counselor. After graduation, she worked in a private practice with children and their families. She also worked her last eight years in Florida as a Guidance Counselor at Park Maitland School in Florida. She has treated all ages and a wide range of issues including Depression, Anxiety, ADHD, ADD, Grief, Loss and Addiction treatment.

Gail is a full professional member of the American Counseling Association and is a Nationally Certified Counselor. She was inducted as a lifetime member in Psi Chi National Honor Society in Psychology for academic achievement. In the past, she held the position of President of the Central Florida Marriage and Family Therapy Association. Gail is actively involved in her church, loves to spend time with her family, friends and volunteers in the community benefiting The Council on Alcohol and Drugs and at her daughter's school.

Gail works in a collaborative fashion to help you set your own goals for the therapeutic encounter. She utilizes a variety of therapeutic modalities including and not limited to Client Centered Therapy, Cognitive behavioral Therapy, Mindfulness, Narrative Therapy and Solution Focused Therapy.

"We all face struggles and challenges along our journey of life. My goal is to provide a safe empathic environment for individuals of all ages, couples and families. We are all given this gift of life and my goal is to help people live their best life possible with love, truth and grace."