From his website bio

Bessel van der Kolk, MD, has spent his career studying how children and adults adapt to traumatic experiences, and has translated emerging findings from neuroscience and attachment research to develop and study a range of treatments for traumatic stress in children and adults. Much of his research has focused on how trauma has a different impact at different stages of development, and that disruptions in care-giving systems have additional deleterious effects that need to be addressed for effective intervention. In order to promote a deeper understanding of the impact of childhood trauma and to foster the development and execution of effective treatment interventions, he initiated the process that led to the establishment of the National Child Traumatic Stress Network (NCTSN), a Congressionally mandated initiative that now funds approximately 150 centers specializing in developing effective treatment interventions, and implementing them in a wide array of settings, from juvenile detention centers to tribal agencies, nationwide.

https://www.besselvanderkolk.com/about/biography