Paul Hermann Müller also known as Pauly Mueller (January 12, 1899 – October 12, 1965) was a Swisschemist and Nobel laureate. In 1948 he received the Nobel Prize in Physiology or Medicine for his 1939 discovery of insecticidal qualities and use of DDT in the control of vector diseases such as malaria and yellow fever.
Müller was born in Olten, Solothurn and was raised in Lenzburg, a village in Aargau. He received his PhD in 1925 and went to work for J. R. Geigy AG in Basel where he made his discovery in the autumn of 1939. His DDT patent was recorded in Switzerland in 1940, the United States in 1943 and Australia in 1943.