Mac McClellan

Mac McClellan is a seasoned Senior PKI Engineer with extensive experience in managing Public Key Infrastructure (PKI) operations and security. Currently at Gallagher since July 2025, Mac oversees enterprise-wide PKI strategy with a focus on Keyfactor technologies. Previously, Mac served as CyberSecurity Tech Lead at Freddie Mac, enhancing key and certificate management services, and held the position of SecOps PKI Engineer at nTropy.io, Inc., where design and implementation of PKI systems were key responsibilities. With a solid foundation at PayPal, Mac progressed from Security Engineer to Systems/Network Engineer, managing PKI systems, improving processes, and leading compliance initiatives. Earlier career roles include Build Engineer at HENDALPHER CONSULTING, LLC, and Senior Linux Systems Engineer at Scientific Research Corporation, specializing in Linux server environments and adherence to security standards. Mac holds a degree from American InterContinental University.