Picture book
In 1938, the American Library Association (ALA) began presenting annually the Caldecott Medal to the most distinguished children's book illustration published in the year. The Caldecott Medal was established as a sister award to the ALA's Newbery Medal, which was awarded to a children's books "for the most distinguished American children's book published the previous year" and presented annually beginning in 1922. During the mid-forties to early fifties, honorees included Marcia Brown, Barbara Cooney, Roger Duvoisin, Berta and Elmer Hader, Robert Lawson, Robert McCloskey, Dr. Seuss, Maurice Sendak, Ingri and Edgar Parin d'Aulaire, Leo Politi, Tasha Tudor, and Leonard Weisgard.
Helen Caldicott
During her time in the United States from 1977 to 1986, Caldicott was the founding president from 1978 to 1983 of Physicians for Social Responsibility (founded in 1961 and dormant from 1970 to 1978), and she helped to recruit 23,000 doctors committed to educating the public and their colleagues on the dangers of nuclear energy. She also worked abroad to establish similar national groups that focused on education about the medical dangers of nuclear energy, nuclear weapons and nuclear war. The umbrella organisation International Physicians for the Prevention of Nuclear War was awarded the Nobel Peace Prize in 1985.