“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 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.


Gabriel Jasso, PsyD, ABBHP, ABDA, ABMPP

Neuropsychologist, Clinical Psychologist

Dr. Gabriel Jasso is a Texas licensed psychologist. He earned a doctorate and masters of arts degree in Clinical Psychology from the Texas School of Professional Psychology in Dallas, Texas. Dr. Jasso completed a pre-doctoral internship where he acquired clinical skills as a psychologist. Soon after, he completed a two-year post-doctoral residency in clinical neuropsychology where he focused his training in providing neuropsychological assessments to brain injury patients.

Additionally, Dr. Jasso earned a master of arts degree in Legal Studies and a bachelor of arts degree in Anthropology both from Texas State University in San Marcos, Texas. His clinical research includes exploring intelligence levels, and the role that learning disorders and legal history play in the homeless population. He is board certified by the American Board of Disability Analysts. He is board certified by the American Board of Behavioral Healthcare Practice. Dr. Jasso is a Clinical Associate with the American Board of Medical Psychotherapists. Dr. Jasso also has a certificate of achievement to provide neuropsychological assessments for the visually impaired.

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Stephanie Walker, LPC, LCDC

Licensed Professional Counselor

Stephanie received her bachelor degree in Elementary Education from Texas A&M University-Commerce. After 11 years in the classroom, Stephanie returned to school and received her Master Degree in Counseling Psychology from Criswell College in Dallas, TX. Stephanie began her counseling career working in addiction recovery for a local residential treatment center. Stephanie has experience treating adolescents, adults, and couples and specializes in emotional and sexual trauma, PTSD, Borderline Personality Disorder, addiction, anxiety, and depression. She is trained in Dialectical Behavioral Therapy (DBT) which is a proven form of treatment for individuals struggling with unhealthy communication styles and overwhelming emotions. Stephanie is also trained in Eye Movement Desensitization and Reprocessing (EMDR) which is utilized to treat anxiety based disorders including PTSD, emotional/sexual trauma, and negative beliefs about oneself. Stephanie has experience providing marital and couples counseling. She is a Prepare-Enrich Facilitator and is trained in the Gottman Method of couples counseling.

Stephanie has a blended family with 6 children, including one on the autism spectrum. During her free time, Stephanie is actively involved in her local church and enjoys spending time with her 5 grandsons whenever possible.


Rebecca Udermann, BSN

Practicum Student

Rebecca received her Bachelor of Science in Nursing in 2010 and is currently pursuing a Master of Arts in Counseling at Dallas Theological Seminary. She has spent the last 9 years navigating the complex journey of healing alongside patients and families experiencing trauma and loss through her role as a Pediatric Intensive Care Nurse in Fort Worth and while living overseas in Haiti and Africa.

Through these experiences Rebecca has cultivated a deep passion for walking alongside individuals as they grieve, process, and search for healing in the midst of whatever life circumstance they are facing. It is Rebecca’s hope that her clients will experience the therapeutic setting as a safe, welcoming environment for reflection, self-awareness and restoration as they move towards living a life of full authenticity.

In her leisure time, Rebecca enjoys training for and running marathons, baking sweet treats, spending quality time with family and friends, traveling internationally, exploring the outdoors and early mornings with a fresh cup of tea.