Paul Hermann Müller (January 12, 1899 – October 12, 1965) was an Swiss chemist. He won the Nobel Prize in Physiology or Medicine in 1948 for his discovery of insecticidal qualities and use of DDT in the control of vector diseases. He was born on January 12, 1899 in Olten, Switzerland and died on October 12, 1965 in Basel, Switzerland.