Arthur J. Ammann

Arthur J. Ammann

In 1982, when pediatric immunologist Arthur Ammann documented the first known cases of AIDS transmission from mothers to infants, little was known about the disease. Today, more than two dozen drugs treat those infected by HIV, especially in wealthier countries. In...
Dr. Pamela Cantor

Dr. Pamela Cantor

A few weeks after September 11, 2001, Pamela Cantor, then 53, received a call from the New York City Board of Education asking her to lead a team to assess the emotional impact of the attacks on the city’s public school children. As a child psychiatrist...
David Campbell

David Campbell

Technology executive David Campbell never imagined that a casual lunch with a friend in Boston in December 2004 would change the course of his life. Their conversation turned to the devastating Indian Ocean tsunami that had ravaged Southeast Asia two days earlier. It...