As executive vice president and chief information officer at T-Mobile, Jeff Simon is at the forefront of transforming the Un-carrier into a deeply data-informed, AI-enabled, digital-first company.

Jeff is building a bold, fast-moving engineering organization that powers every corner of the T-Mobile experience, from digital and retail to enterprise and internal systems. Partnering with T-Mobile's go-to-market leaders, Jeff is charged with delivering technology that perfects the customer’s journey and earns their loyalty for life. His work is central to accelerating the company’s broader technology evolution — streamlining infrastructure, embedding AI, hardening cybersecurity, and modernizing at scale.

Jeff joined T-Mobile in 2023, leading an unprecedented transformation of the company's cybersecurity capabilities. Under his leadership, T-Mobile rapidly modernized technology across the company to improve operational stability, resiliency, and cyber defense. After spearheading cybersecurity modernization, Jeff expanded his scope to lead technology modernization efforts across core billing, commerce, and enterprise systems — laying the foundation for the high-velocity, high-impact technology organization he leads today.

Before T-Mobile, Jeff served as chief information security officer at FIS, the world’s leading financial technology provider. There, he safeguarded systems powering over 20,000 financial institutions and $14 trillion in annual transactions. His success stemmed from an engineering-led approach that rapidly evolved technologies to stay ahead of the adversary.

Jeff holds a Master of Science in Computer Science from Johns Hopkins University and a Bachelor of Science in Business Administration from Marquette University.

A Milwaukee native, Jeff enjoys spending time with his wife, two daughters, son, and their beloved puppy. An avid snowboarder and ice hockey player, he also enjoys traveling the world and exploring diverse cuisines.