Our People

A family owned business since 1957, Grae-Con has built itself on family values. We instill in our staff members the teamwork and dedication it takes to succeed, which is why over half our staff has been with us for more than 15 years. With over 750 years of combined management experience, we've established  ourselves as leaders in the industry, with a continual motivation to go beyond building.



Robert A. Gribben, Jr.


Mr. Gribben is the founder and owner of Grae-Con.   He has over 40 years of construction experience, with a majority of his tenure spent in upper management beginning with his father’s company, Robert A. Gribben Construction from 1978, until Grae-Con’s beginning in 1987.  He is Principal-In-Charge of all operations, including but not limited to- office management, design management, estimating, project management and coordination of a majority of the projects in progress.   Additionally, he directs the coordination and preparation for value engineering services, constructability reviews and adherence to contract documents on these elements. Mr. Gribben holds a Bachelor of Science in Business and Economics from Morehead State University and completed his graduate studies in Construction Technologies at Bowling Green State University.

John A. Humpe III

Vice President

John has been with Grae-Con since its inception in 1987. John has over 30 years of supervision experience.  As Executive Vice President, John assists with the day-to-day operations of the company.  John is the chief estimator and his main responsibility is the thorough review of estimates and contracts. John is also heavily involved in the design/build program and serves as a project manager on high profile projects.

Robert A. Gribben, III

Vice President

Rob has been working for Grae-Con since 1996. He joined our company full time in 2002.  In brief, Rob is in charge of all aspects of the company’s business development program and overseeing its’ progress. Rob also serves as a project manager/estimator and is the chairman of both the companies’ Safety Committee and TQM Committee.  Finally Rob sits on the companies’ Board of Directors as Treasurer. Rob holds a Bachelor of Science in Construction Systems Management from Ohio State University and completed his graduate studies in Civil Engineering at Youngstown State University.