Internet Service Providers sit at the backbone of the digital economy. They operate large scale, always on networks that support cloud services, mobile communications, financial transactions, and critical national infrastructure. This position makes ISPs high value targets for cybercrime, nation state activity, and systemic disruption. Security leaders in this sector must balance resilience, regulatory scrutiny, customer trust, and rapid technology change across highly distributed environments. The CISOs below stand out for their scope, influence, and leadership across the ISP and telecommunications landscape.
Greg Temm — SVP and Chief Information Security Officer, Charter Communications
Greg Temm is Senior Vice President and Chief Information Security Officer at Charter Communications, where he leads enterprise cybersecurity and risk management across one of the largest broadband providers in the United States. His background spans both financial services and communications, giving him a strong foundation in governance, compliance, and operational security. Greg has deep experience with ISO 27001 and NIST CSF and has led programs covering vulnerability management, threat intelligence, forensics, and security policy. At Charter, he focuses on building resilient security programs that scale with complex network operations while supporting business growth.
Ali Waezzadah — SVP and Chief Information Security Officer, Frontier Communications
Ali Waezzadah serves as Senior Vice President and Chief Information Security Officer at Frontier Communications, bringing more than two decades of experience across cybersecurity, data privacy, and enterprise risk management. His career includes leadership roles in both public and private sector organizations with high security requirements. At Frontier, Ali plays a key role in securing broadband infrastructure during periods of transformation and expansion. He is known for aligning cybersecurity strategy with operational priorities, ensuring customer data protection while maintaining the reliability of essential communications services.
Jeff Simon — Executive Vice President and Chief Information Officer, T-Mobile
Jeff Simon is Executive Vice President and Chief Information Officer at T-Mobile, where he oversees enterprise technology and plays a central role in cybersecurity leadership. Prior to becoming CIO, he served as Chief Security Officer and led a multi year cybersecurity transformation across the organization. His background includes senior leadership roles at FIS, where he managed large scale global security operations protecting financial systems at massive scale. At T-Mobile, Jeff focuses on securing digital commerce, billing platforms, and B2B services while enabling data driven and AI enabled customer experiences.
Keith Frederick — Chief Information Security Officer, Viasat Inc.
Keith Frederick is Chief Information Security Officer at Viasat and a nationally recognized cybersecurity leader with more than 30 years of experience across commercial, federal, and defense environments. A retired U.S. Air Force officer with deep experience in the intelligence community, Keith brings strong engineering and risk management expertise to securing satellite and global communications systems. At Viasat, he leads enterprise security, product assurance, compliance, incident response, and resilience across both commercial and government offerings, combining technical depth with executive leadership.
Leslie Anderson — Global Chief Security Officer and Director of Cyber Information Security, BT Group
Leslie Anderson is Global Chief Security Officer at BT Group, leading one of the most mature cybersecurity operations in the global telecommunications sector. He oversees 24 by 7 cyber operations, incident response, ethical hacking, and information assurance across BT’s international footprint. Leslie brings more than 27 years of experience from the UK intelligence, security, and defense community, including senior roles at GCHQ and the Ministry of Defence. His leadership emphasizes resilience, governance, and board level accountability in a constantly evolving threat landscape.
Securing the Networks That Power Everyday Life
ISP CISOs operate at a unique intersection of national infrastructure, commercial innovation, and public trust. Their responsibilities extend beyond enterprise security into societal resilience, economic stability, and public safety. As connectivity becomes more critical and more contested, the leaders highlighted here demonstrate how strong governance, technical depth, and strategic alignment are essential to keeping the world connected securely and reliably.