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Dan Guido is the co-founder and CEO of Trail of Bits, a New York-based security research firm that audits and rebuilds the software behind critical technology. Since 2012 the firm has grown to more than 140 engineers working across cryptography, AI, and blockchain security, and it has been consistently named one of NYC's Best Places to Work. The firm audited Zoom's meeting client in 2020 and WhatsApp's private AI infrastructure in 2026, and its research showed that a handful of entities control most of Bitcoin. It placed second in DARPA's 2025 AI Cyber Challenge, earning $3 million for vulnerability discovery and patching. In 2019 Dan created iVerify to detect mercenary spyware like NSO Group's Pegasus; it spun out as an independent company in 2023.

Dan advises startups, government agencies, and policymakers. He co-chaired the cybersecurity subcommittee of the CFTC's Technology Advisory Committee from 2023 to 2024, has worked on cybersecurity policy with the Council on Foreign Relations, RAND, and Harvard, and serves on the boards of three startups. He founded Empire Hacking, an 1,800-member New York security meetup, and created Algo VPN, a self-hosted VPN server with 28,000 GitHub stars that The New York Times recommends.

Dan holds a BS in computer science from NYU Tandon, where he helped start the OSIRIS Lab as a student. He later taught more than 300 students there over seven years and was the school's first Hacker in Residence. With Trail of Bits, he trained cadets at the US military service academies to hack and turned that material into the public CTF Field Guide. He came up through the CyberCorps Scholarship for Service program with internships at the NSA, and CISA inducted him into its Hall of Fame in 2021. He is finishing Harvard Business School's Owner/President Management program in October 2026. At Mineola High School, his alma mater, he funds the Hacker Spirit Scholarship for the senior who teaches themselves to take systems apart.