Core values

At Graboyes, we entrust our employees with the responsibility of always doing what’s right. Our core values guide our approach and actions: 

Simply stated, our most important asset is our people. As a team we celebrate each other’s talents and achievements, and we are grateful for the many clients and partners who place their confidence in us. Our goal is to continue to deliver — every single day — on our promise of excellence.

Meet our office staff

Philadelphia MBE commercial window installer

Ellis Guiles, P.E., LEED AP
Owner / President

Robert Gushue
VP of Finance

Laura Duran Guiles
Corporate Director / VP of Communications

Bill Steedle
Chief Estimator

Greg Laska
Operations Manager

Les Schlemback
Manager of Preconstruction Services

Chris DelRossi
Procurement Specialist

Gail Bilotta
Assistant Controller


Joe Mignone
Project Manager