William Deang specializes in protective design and security at Thornton Tomasetti, with experience in threat, vulnerability, and risk assessments, low-voltage standards evaluations, and existing-conditions assessments. He works across electronic security and telecommunications, including access-control systems (ACS), intrusion detection systems (IDS), various/advanced security systems (VASS), structured cabling, and backbone and horizontal pathway distribution. William collaborates with multidisciplinary protective design specialists, architects, and engineers to help clients deliver integrated, layered security and communications solutions that align with operational, infrastructure, and facility requirements while supporting resilience, functionality, and long-term performance.