John Fein is a former elite distance runner who explicitly connects the discipline, resilience, and long-term mindset of serious running to how he evaluates and supports founders, often referencing endurance, pacing, and consistency as core to his investing style. He ran three Techstars accelerator programs and personally worked with scores of founders before raising a fund, bringing structured programming, dense mentorship, and hands-on company-building habits from Techstars into his day-to-day venture work at Firebrand. John Fein is a former elite distance runner who explicitly connects the discipline, resilience, and long-term mindset of serious running to how he evaluates and supports founders, often referencing endurance, pacing, and consistency as core to his investing style. He ran three Techstars accelerator programs and personally worked with scores of founders before raising a fund, bringing structured programming, dense mentorship, and hands-on company-building habits from Techstars into his day-to-day venture work at Firebrand.