David Lehman

About National Glass Products (NGP) National Glass Products (NGP) is a private equity–backed platform uniting six premier glass and glazing companies across the United States. Together, our brands design, fabricate, and install custom glass solutions for residential, commercial, and specialty markets—combining local expertise with national capability. Denver Glass Interiors (DGI) – Denver, CO Our corporate headquarters and a leading interior glass provider since 1990. DGI offers complete in-house fabrication—including tempering, laminating, back-painted glass, and custom aluminum shower door systems—allowing exceptional quality, faster turnaround, and seamless installation. Our work appears in many of Colorado’s most iconic hotels, offices, restaurants, multifamily projects, casinos, and sports venues. Bel Shower Door (BSD) – Denver, CO Serving customers since 1973, BSD specializes in premium shower doors, mirrors, and custom glass products. With master craftsmen and full in-house production, BSD delivers durable, high-precision solutions for builders and homeowners. Theut Glass – Columbus, TX For more than 35 years, Theut Glass has provided high-performance commercial glass systems across the greater Houston area. Known for detailed project management and custom aluminum and steel fabrication, Theut excels in educational and institutional projects with demanding schedules and specifications. B&W Glass – Cheyenne, WY A trusted partner since 1978, B&W Glass has grown from a small stained-glass shop into a full-service residential and commercial glass company. Decades of employee expertise and a strong customer-first culture define its approach to every project. Illumination Window & Door – Scottsdale, AZ A premier provider of residential window and door replacement services in the Phoenix metro area. With the region’s largest showroom and a highly personalized customer experience, Illumination has been a trusted partner to homeowners across the Valley of the Sun since 2012. Aspen Glass – Colorado Springs, CO A leading fabricator and installer of interior glass solutions, Aspen Glass is known for craftsmanship, responsiveness, and bringing design visions to life for both residential and commercial customers. Our Vision NGP’s strength lies in pairing strong local market leadership with national resources, investment, and innovation. Across all our companies, we share a commitment to craftsmanship, service, and operational excellence—delivering glass solutions that elevate the spaces where people live, work, and connect.