Today's high-tech building systems from Kalwall are derived from a concept invented over 50 years ago by the company's founder, Robert Keller. By the end of World War II, Keller had started in business with his own fabrication shop. He had amassed an impressive background of practical experience in the fields of laminating, bonding dissimilar materials, and working with high strength, lightweight construction materials utilized in airplane manufacturing. This was the "golden age of bonding."