Original: The Swiss chemist Paul Hermann Müller of Geigy Pharmaceutical was awarded the Nobel Prize in Physiology or Medicine in 1948 "for his discovery of the high efficiency of DDT as a contact poison against several arthropods.
Simplified: The Swiss chemist Paul Hermann Müller was awarded the Nobel Prize in Medicine in 1948, for his discovery.NobelPrize.org: The Nobel Prize in Physiology or Medicine 1948 Accessed July 26, 2007.