St. Louis has long been a major corporate headquarters town, and it still is. But it’s also morphing into a startup hotbed, with an entrepreneurial ecosystem rivaling any of America’s great regions. As a result, St. Louis is not only one of the nation’s most concentrated major markets for financial advisors and healthcare workers, and not only home to nearly 15,000 people building the most sophisticated military aircraft in the world.  It’s also home to the nation’s fastest-growing technology incubator; numerous business plan competitions, including the world’s largest; and a big and growing life sciences industry. These two sectors – the corporate and the start-up community – don’t merely operate in parallel: They interact and nurture each other, through mentorship relationships, financial support and much more.