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... see more