Philadelphia-based Graboyes Commercial Window Company announced that Ellis Guiles, P.E., LEED AP, has assumed the role of owner and president. Guiles and his investment partners recently acquired the company from previous owners Tricia Scott, John Scott and company founder Terry Graboyes. Guiles previously served as senior manager of sales and business development for Siemens Building Technologies. He is a licensed professional engineer with a master’s degree in business administration in global product strategy and 35 years of experience in building performance, HVAC and construction. Guiles has held positions in research and development, manufacturing, sales, distribution, business development, marketing and general management.