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 a Venture Partner at Costanoa Ventures, where he helps on investing strategy and backing early-stage cybersecurity companies. In addition, he is 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 US Congress twice, been a commissioner on the National Action Alliance for Suicide Prevention, a board member on the National Cyber Security Alliance, a many-time opening plenary speaker at the Dallas Crimes Against Children Conference, a participant in a White House anti-online-bullying effort, an advisor to the Department of Homeland Security, and in 2016 accepted and served an appointment from President Obama to his Commission on Enhancing National Cybersecurity.