Lex Bayer is a Silicon Valley technology entrepreneur and CEO of Quizlet. Previously he was the CEO of Starship Technologies, an on-demand delivery company that has completed over 3 millions deliveries with self-driving robots. At Airbnb he led the Business Development, Payments and Airbnb for work teams, and was the CEO of Airbnb Payments Inc. Lex co-founded and was the CEO of Spare Change Payments, a digital wallet company, which was subsequently acquired by PlaySpan and then Visa Inc. He received his BS and MS degrees in engineering at Stanford University and holds over 20 patents.