Max Levchin (@mlevchin) Founded @Affirm and Slide. Co-Founded @PayPal, along with Peter Thiel and Elon Musk. Invented the CAPTCHA. Runs a $22 Billion publicly traded company. And launched the Levchin Prize for real-world cryptography. I sat down with Max Levchin, Co-Founder and CEO of Affirm, for a