The International Maternal Pediatric Adolescent AIDS Clinical Trials (IMPAACT) group is a NIH/NIAID/DAIDS Funded Network Group representing a merger of investigators from the Pediatric AIDS Clinical Trials Group (PACTG) and the Perinatal Scientific Working Group of the HIV Prevention Trials Network (HPTN/HIVNET).

The group is headed by group Chair, Brooks Jackson, MD, MBA (Johns Hopkins).

Social & Scientific Systems, Inc. (SSS), supports the Coordinating and Operations Center (CORE).

The Statistical Data Management Center (SDMC) for the IMPAACT group is SDAC/FSTRF headed by Terry Fenton, Ed.D (Harvard). Susan Fiscus, PhD (U North Carolina), heads the Central Laboratory Network structure for the group.