John Brennan works hands-on with cybersecurity founders from before they even have a concrete idea through their A-round, helping with research, strategy, and daily pipeline work rather than just providing capital. He manages a network of 120+ cybersecurity experts that he uses systematically to give founders targeted customer insights, and he evaluates founding teams based on whether he'd be excited to meet with them weekly for 5-10 years as a key investment criterion. John Brennan works hands-on with cybersecurity founders from before they even have a concrete idea through their A-round, helping with research, strategy, and daily pipeline work rather than just providing capital. He manages a network of 120+ cybersecurity experts that he uses systematically to give founders targeted customer insights, and he evaluates founding teams based on whether he'd be excited to meet with them weekly for 5-10 years as a key investment criterion.