Karen E. Klein (via Cobalt Paladin):
For nearly two decades, Jonathan Hirshon has nurtured startup entrepreneurs as a Silicon Valley marketing and communications consultant. Along the way, Hirshon has observed both sorry failures and stunning successes, and he became an entrepreneur himself — founding Horizon Communications, a Santa Clara (Calif.)-based consultancy, in 1995. Though it takes plenty of moxie to start a company, Hirshon says, it’s the outsized entrepreneurial ego that most often brings down startups.