John M. Tinker (1897-1974) was the director of Jackson Laboratory, the main research unit of the Organic Chemicals Department of E.I. du Pont de Nemours & Company, from 1943 to 1962. After his retirement, he joined the U.S. Foreign Service and worked for three years as the science attaché at the U.S. Embassy in Karachi, Pakistan. This small collection of Tinker's papers is related to both his time at Jackson Laboratory and his work for the U.S. government.