Guy Spier is a Zurich-based investor and the author of The Education of a Value Investor. Since 1997, he has managed the Aquamarine Fund with $350 million in assets. He is known for bidding US$650,100 with Mohnish Pabrai for a charity lunch with Warren Buffett in 2008. In 2009, Atul Gawande wrote about him in The Checklist Manifesto for using checklists in his investment process.

Guy previously worked as an investment banker in New York and as a management consultant in London and Paris. He has an MBA from the Harvard Business School, class of 1993, and holds a First Class degree in Politics, Philosophy and Economics from Oxford University. On graduating from Oxford, he was co- awarded the George Webb Medley prize for the best performance that year in economics.

Guy currently lives in Switzerland with his wife Lory and their three children, Eva, Isaac and Sarah.