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Bryan Johnson (born August 22, 1977) is an American entrepreneur, venture capitalist, writer and author. He is the founder and former CEO of Kernel, a company creating devices that monitor and record brain activity, and OS Fund, a venture capital firm that invests in early-stage science and technology companies.

Johnson was also the founder, chairman and CEO of Braintree, a company specializing in mobile and web payment systems for e-commerce companies. Braintree acquired Venmo in 2012 for $26.2 million; the combined entity was acquired by PayPal for $800 million in 2013.

Johnson has received media attention for his anti-aging attempt that he refers to as "Project Blueprint".

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