Tammi Van Hollander, LCSW, RPT-S, Owner

Tammi Van Hollander, LCSW, RPT-S is a licensed clinical social worker and Registered Play Therapist Supervisor, and has spent over 20 years working with children, families and individuals. Her work and creative interventions in the field of play therapy have been published and internationally recognized. Tammi is the author of a multi-sensory, attachment-based children’s book titled, Casey’s Greatness Wings: Teaching Mindfulness, Connection, and Courage to Children. The success of the book inspired her to create Casey’s Greatness Sticks & Greatness Cards to be used in schools, counseling and in the home. She specializes in attachment, sand tray play therapy & sensory integration working with infants, children, families, and adults of all ages.

She holds a Master of Social Work from The University of Pennsylvania and has had extensive training and supervision from The Family and Play Therapy Center in Philadelphia.


She is a certified Advanced Trainer for the Nurtured Heart Approach®, a certified FirstPlay® practitioner and a founding board member of The World Association for Sand Therapy Professionals. 

Sandra Holloway, LPC, LBS, R-DMT, PhD

Sandra Holloway, LPC, LBS, R-DMT, PhD (genetics) is a licensed professional counselor, licensed behavior specialist, Registered Dance Movement Therapist, and PhD level biologist. She has taught Developmental Psychology and Biopsychology at local Universities for 10 years.


Sandra has worked as a dance movement therapist and play therapist with children for 19 years in hospitals, intensive outpatient programs, schools, in the community, and in private practice. During her sessions with children, Sandra is known for creatively adapting whatever your child brings to the session into a fun and therapeutically helpful activity that has a foundation in evidence-based practices and the biology of the child’s developing brain.


Sandra has held workshops locally and within the United States on parent education, trauma-informed practices, and on developing an environment in schools and institutes (including for elite athletes) that supports the mental health of children. Sandra also works with adults.

Women's Group in India
Tammi Van Hollander, LCSW, RPT-S
sandtray training
Sandra Holloway

Sandra Holloway, LPC, LBS, R-DMT, PhD