John Hummer says he’s on his third life. The first was as a professional basketball player, then as a pioneering venture capitalist, and now as a retiree who gets to fly around in his cherry 1985 Model 1000 Twin Commander. Given the airplane and how he uses it, it seems like Hummer is having as much success in his third life as he did the first two. Hummer is perhaps best known for his first life, that of professional basketball player. He grew up in Arlington, Virginia, and excelled as a high school athlete. That success took him to Princeton, where he is still regarded as one of the best players in the school’s illustrious basketball tradition. He was the…