Found this on YouTube: In Depth from and about Interactive Brokers - Raleigh-Durham Group Meeting - 20211109 We invited senior officers of Interactive Brokers (two close to Thomas Peterffy himself) to address our own prepared questions (see attached) gathered from our members in advance and organized by us. David Friedland is Asia Pacific Managing Director at Interactive Brokers and also a long-time official liason with trading groups for all of Interactive Brokers worldwide. Steve Sosnick is Chief Strategist/Head Trader of Interactive Brokers/ Timber Hill. Eric S. Cott is a Consultant with Interactive Brokers Global Institutional Sales & Prime Brokerage for Hedge Funds, Independent Advisors, & Broker Dealers. I think you will find fascinating insights on how Timber Hill made markets, and traded profitably, among other aspects.