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After building Braintree into an $800 million PayPal acquisition — a deal that handed America Venmo's 90 million users — Johnson pivoted to neuroscience and a $2 million-a-year personal longevity experiment redefining what human optimization looks like.
Bryan Johnson founded Braintree, which acquired Venmo before selling to PayPal for $800 million in 2013, when it was processing over $12 billion annually.
He later founded Kernel, a neuroscience company developing non-invasive brain-computer interface technology, and Blueprint, a longevity protocol he documents publicly while spending over $2 million annually on his personal health regimen. Venmo now has over 90 million users.
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