Monsanto Monsanto The Monsanto Company () was an American agrochemical and agricultural biotechnology corporation that existed from 1901 until 2018 when it was acquired by Bayer. It was headquartered in Creve Coeur, Missouri. Monsanto developed Roundup, a glyphosate-based herbicide in the 1970s, and became a major producer of genetically engineered crops. Monsanto was one of four groups to introduce genes into plants (1983), and was among the first to conduct field trials of genetically modified crops, (1987). It was one of the top 10 U.S. chemical companies until it divested most of its chemical businesses between 1997 and 2002, through a
Monsanto renamed in honor of Leo Sauget, its first village president. In 1935, Monsanto bought the Swann Chemical Company in Anniston, Alabama, and thereby entered the business of producing PCBs. In 1936, Monsanto acquired Thomas & Hochwalt Laboratories in Dayton, Ohio, to acquire the expertise of Charles Allen Thomas and Carroll A. Hochwalt. The acquisition became Monsanto's Central Research Department. Thomas spent the rest of his career at Monsanto, serving as President (1951–1960) and Board Chair (1960–1965). He retired in 1970. In 1943, Thomas was called to a meeting in Washington, D.C., with Leslie Groves, commander of the Manhattan Project, and