Bob Stewart is the managing partner of Stewart Farms, a multi-generation family grain farm headquartered 50 miles southwest of Chicago in Yorkville, Illinois. The farm, which he operates along with his brother, Brad, his wife, Sarah, and father, Craig, raises commercial corn, soybeans and seed corn. Stewart Farms uses a wide range of precision ag technologies, including RTK-based guidance systems on all of its machinery and controlled-traffic patterns for field operations.