In this episode of the Wharton Fintech Podcast, host Sabrina Fathi chats with Seth Rosenberg, General Partner at Greylock, about what it takes to build and back enduring companies at the intersection of fintech and AI. Seth shares lessons from launching Facebook Messenger, insights on founder-market fit, and how great early-stage companies validate ideas, build defensibility, and navigate market shifts. With deep takes on AI, blockchain, and the future of financial services, this episode is packed with practical wisdom for builders and investors alike.