"Bruce D. Perry, M.D., Ph.D. is the Senior Fellow of The ChildTrauma Academy, a not-for-profit organization based in
that promotes innovations in service, research and education in child maltreatment and childhood trauma. /.../ Houston
Dr. Perry has conducted both basic neuroscience and clinical research. His neuroscience research has examined the effects of prenatal drug exposure on brain development, the neurobiology of human neuropsychiatric disorders, the neurophysiology of traumatic life events and basic mechanisms related to the development of neurotransmitter receptors in the brain. His clinical research and practice has focused on high-risk children - examining long-term cognitive, behavioral, emotional, social, and physiological effects of neglect and trauma in children, adolescents and adults. This work has been instrumental in describing how childhood experiences, including neglect and traumatic stress, change the biology of the brain – and, thereby, the health of the child."
Here an interview with him.
Also see here, that for instance say:
"Bruce D. Perry, M.D., Ph.D., is an internationally-recognized authority on children in crisis. Dr. Perry is the Provincial Medical Director in Children’s Mental Health for the Alberta Mental Health Board. In addition, he is the Senior Fellow of the
(www.ChildTrauma.org), a Houston-based organization dedicated to research and education on child maltreatment. Dr. Perry has been consulted on many high-profile incidents involving traumatized children, including the Columbine, ChildTrauma Academy school shootings, the Colorado bombing, and the Branch Davidian siege." Oklahoma City
Addition: also see about Allan Schore.