Jeff Graff
Jeff is the STI Technology Manager and Precision Farming Expert.  He previously served STI as our Service Manager and After Market Manager.  Prior to moving to Sigourney, Jeff spent 10 years working as a CSR for a John Deere dealer in Northwest Iowa. He holds a bachelor's degree in agricultural systems from Iowa State University and has attended several John Deere Training courses: JDIS Advanced Concepts of Service, Service Time Management, Parts Management and Marketing, CSR Concepts, Parts Retail Merchandising, Service Management and Marketing and the AMS Masters Program. Jeff and his wife, Darian, have three children: Lainey, Justin and Jessica. A lover of the great outdoors, Jeff enjoys building fast cars, drag racing, camping, fishing and spending time with his family.

Brett Gregory

Brett is the Yield Force^TM Agronomist at STI.  He as 16 years experience working as an Agronomist for Heartland Coop and 2 years as a field applicator at Farm Service.  Brett earned an associates degree in Ag Business from Ellsworth Community College and is a Certified Crop Advisor.  He and his wife, Traci, reside in Montezuma with their two daughters, Katelyn, 14; and Kerri, 12.  In his spare time he enjoys camping, hunting and attending his girls activities.

Mitch Weldon

After working for STI as a Summer Intern, Mitch returned to STI as a full-time AMS Specialist upon graduating from Kirkwood Community College with a degree in GPS/GIS.  A resident of Haysville, Mitch enjoys anything to do with the outdoors in his spare time.

Bill VanDeventer
Bill is our Assistant Manager for Sigourney Technologies and joined STI with a degree in computer networking and security from Indian Hills Community College. In past years, Bill has been an aircraft electronics technician in the United States Navy, an electrician and a CNC programmer. In his spare time, Bill enjoys hunting, fishing, camping, boating and skiing.