William "Bill" Sinclair

With four decades of experience in the glazing industry, Bill Sinclair has dedicated his career to mastering the craft of glasswork — and his expertise is a major reason ITDG can self-perform a trade that most general contractors are forced to subcontract. As Glazing Division Manager, Bill oversees all operations at Geronimo Glass, ensuring precision, quality, and efficiency in every project from storefront installations to curtain wall systems.

Bill's extensive knowledge of glazing materials, structural requirements, and installation techniques allows him to deliver exceptional solutions tailored to each client's specific needs. Whether it's a hotel-to-multifamily conversion requiring hundreds of new window units or a commercial storefront that needs to meet both aesthetic and energy performance standards, Bill's team executes on ITDG's schedule — not a vendor's.

Having an in-house glazing operation led by someone with 40 years of expertise gives ITDG a competitive advantage that few contractors can match. While others wait weeks for a glazing subcontractor to become available, Bill's team is already on site, coordinated with the other six trade divisions, and working in sequence with the overall project timeline.

His leadership and dedication to the craft ensure that the face of your building receives the same level of quality control as every other system inside it.