PSA authenticated signature of Linus Pauling on a first day cover celebrating the United nations treaty on the Non-Proliferation of Nuclear Weapons.  Pauling (1901 –  1994) was a chemist, biochemist, chemical engineer, peace activist, author, and educator. He published more than 1,200 papers and books, of which about 850 dealt with scientific topics. He has been called one of the 20 greatest scientists of all time, and was rated the 16th most important scientist in history. For his scientific work, Pauling was awarded the Nobel Prize in Chemistry in 1954. For his peace activism, he was awarded the Nobel Peace Prize in 1962. He is one of five people to have won more than one Nobel Prize. Of these, he is the only person to have been awarded two unshared Nobel Prizes, and one of two people to be awarded Nobel Prizes in different fields, the other being Marie Curie. Pauling was one of the founders of the fields of quantum chemistry and molecular biology.  His discoveries inspired the work of James Watson, Francis Crick, Maurice Wilkins and Rosalind Franklin on the structure of DNA. In his later years, he promoted nuclear disarmament.

 

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