Christoph Janz, by the way, was an angel investor in our company CalendarHub (an early YC applicant who lost out to Justin Kan's Kiko, I believe). We were lucky to land him, but we weren't at all prepared to take advantage of Christoph's deep knowledge and insight (neither of us were willing to take the leap to full-time), else we might have been far more successful than we were.<p>Christoph was boots-on-the-ground the whole time. Hell, I would say he was in the trenches with us, but that is giving us too much credit. I think he was practically the only one in the fire-fight at times. He was tenacious and bold and he operated on a completely different level than us. At the very least, I got my first glimpse of what a real driven tech entrepreneur looked like.