Linus Carl Pauling was an American chemist, biochemist, peace activist, author, and educator. He was one of the most influential chemists in history and ranks among the most important scientists of the 20th century. Pauling was one of the founders of the fields of quantum chemistry and molecular biology.
For his scientific work, Pauling was awarded the Nobel Prize in Chemistry in 1954. In 1962, for his peace activism, he was awarded the Nobel Peace Prize. This makes him the only person to be awarded two unshared Nobel Prizes. He is one of only four individuals to have won more than one Nobel Prize. Pauling is also one of only two people to be awarded Nobel Prizes in different fields, the other being Marie Curie.
However, his promotion of orthomolecular medicine, megavitamin therapy, dietary supplements, and vitamin C has been criticized.