Suggest an update Name* Categories* State* Locality* ZIP* Street address* Phone* Website* Company description* Lawyer Byron Vaughn Olsen, Practice Areas No known practice areas. is located in the city of Chesterfield, the state of Missouri. Attorney legal address Monsanto Co.700 Chesterfield Pkwy WChesterfield, MO, 63017-1732. For more information, please call (636) 737-5749 Your comments* (not for publishing) * — Required information Byron Vaughn Olsen ← View details Monsanto Co.700 Chesterfield Pkwy WChesterfield, MO, 63017-1732, Chesterfield, Missouri (636) 737-5749