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.

Brian Gay

Brian is our IT Department Manager and comes to STI with 14+ years of experience, previously working as a systems administrator and a pc technician.  Brian resides in Washington and enjoys doing pc modifications and pc gaming.

Bill VanDeventer
As part of our Technology team, Bill handles all aspects of the field.  He 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.