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Peter Yarrow
Peter Yarrow (born May 31, 1938) is an American singer and songwriter who found fame for being in the 1960s folk trio Peter, Paul and Mary. Yarrow co-wrote (with Leonard Lipton) one of the group's best known hits, "Puff, the Magic Dragon". He is also a political activist and has supported causes that range from opposition to the Vietnam War to support for school anti-bullying programs.
Source: Wikipedia