Joe is the CEO of Joe Sullivan Security LLC, where he advises companies of all sizes, leads security consulting projects, and mentors security leaders. He is also the CEO of Ukraine Friends, a nonprofit organization providing humanitarian aid to children striving to learn and grow in a war zone.

Joe has worked at the intersection of government, technology, and security since the mid-1990s. He spent 8 years working for the US DOJ, eventually 100% focused on technology-related crimes, received national recognition from the DOJ for outstanding service as a federal prosecutor, and worked on many first-of-their-kind cybercrime cases, including supporting the digital aspects of the 9/11 investigation. Joe was recruited to eBay in 2002 to build out their eCrime team, and later took on responsibilities at PayPal.

In 2008 Joe moved to Facebook where he became their CSO. He was recruited from there to join Uber in 2015, to be their first CSO. His experiences at Uber are well documented publicly, for better and for worse, including with a chapter dedicated to his life and time at the company in the bestselling book Super Pumped. After Uber Joe was the CSO at Cloudflare from 2018 through 2022. Joe has testified before the U.S. Congress twice and has long been active in international safety and cybersecurity policy efforts. He served on President Obama’s Commission on Enhancing National Cybersecurity, advised the Department of Homeland Security through both a formal task force and ongoing consulting efforts, and participated in a White House initiative to combat online bullying. Joe was a commissioner on the National Action Alliance for Suicide Prevention, a board member of the National Cyber Security Alliance, and has contributed to several other nonprofit safety organizations. He was also a longtime opening plenary speaker at the Dallas Crimes Against Children Conference. In addition, Joe serves as an advisor to San Jose State University through its CAIC Industry Advisory Board and is a member of the Cloud Security Alliance's Safe AI Non-Profit Leadership Council.