Introduction / Brett T. Litz -- Acute stress disorder : course, epidemiology, assessment, and treatment / Richard A. Bryant -- Risk and resilience factors in the etiology of chronic posttraumatic stress disorder / Daniel W. King, Dawne S. Vogt, and Lynda A. King -- Conceptual and definitional issues in complicated grief / Matt J. Gray, Holly G. Prigerson, and Brett T. Litz -- Early intervention for trauma in adults : a framework for first aid and secondary prevention / Brett T. Litz and Matt J. Gray -- Early intervention with infants, toddlers, and preschoolers / Patricia van Horn and Alicia F. Lieberman -- Early mental health interventions for trauma and traumatic loss in children and adolescents / Judith A. Cohen -- Early mental health interventions for traumatic loss in adults / Beverley Raphael and Sally Wooding -- Methodological and ethical issues in early intervention research / Matt J. Gray, Brett T. Litz, and Amy R. Olson -- The professional response in the aftermath of September 11, 2001, in New York City : lessons learned from treating victims of the World Trade Center attacks / Yuval Neria, Eun Jung Suh, and Randall D. Marshall -- Sexual trauma : impact and recovery / Sheila A.M. Rauch and Edna B. Foa -- When the helpers need help : early intervention for emergency and relief services personnel / Cynthia B. Eriksson, David W. Foy, and Linnea C. Larson -- Evaluating and treating injured trauma survivors in trauma care systems / Douglas Zatzick and Amy Wagner -- Early intervention for psychological consequences of personal injury motor vehicle accidents / Edward B. Blanchard ... [et al.] -- The challenge of providing mental health prevention and early intervention in the U.S. military / Carl Andrew Castro, Charles C. Engel, Jr., and Amy B. Adler -- Closing remarks / Brett T. Litz.