Bryan Johnson, an American entrepreneur and venture capitalist, is best known as the founder of the payment processing company Braintree, which bought Venmo in 2012 and was sold to PayPal for $800 million in 2013. After that success, he launched the OS Fund and the neurotechnology company Kernel in 2014 and 2016, respectively, investing $100 million of his own money into each to develop advanced devices that monitor and record brain activity. Since October 2021, Johnson has been the face of Project Blueprint, a radical anti-aging program centered on his "don't die" philosophy that has garnered massive media attention. In 2026, he revealed a diagnosis of an incurable autoimmune disease, a twist in his longevity journey. Earlier that year, documents released by the Department of Justice also confirmed that he had a brief meeting with the disgraced financier Jeffrey Epstein in 2017, a contact Johnson cut off after a single video conference.