Venture investor Byron Deeter reveals why founders should think like athletes, how ethical AI shaped Anthropic's billion-dollar bet, and why CEOs collapse under stress. The Bessemer partner managing $20B in capital—including 26 unicorns—shares lessons from founding a cloud software company before venture, his anti-portfolio strategy, and a wellness program teaching peak performance to startup leaders. Founders who stay longer in their journey unlock irreplaceable product insight and founder magic; hiring a replacement CEO early destabilizes product risk and should only happen jointly or as a last resort. The best leaders combine intense conviction with coachability—they gather input from their team and investors, make decisive action, then revisit decisions when needed rather than turning inward under pressure.