Bieber was an appointed member of the World Trade Center Kinship and Data Analysis Panel (KADAP), assisting the New York City Office of the Chief Medical Examiner with the DNA-based identification of victims of the September 11, 2001 attacks on the twin towers. He participated in the identification of victims of Hurricanes Katrina and Rita, assisting the Louisiana coroners office, as a member of the Hurricane Victims DNA Identification Expert Group (HVDIEG).