The 18-year-old Canadian sensation, whose 2010 concert movie Never Say Never made $100 million globally, invested an undisclosed amount in PhoneGuard, a mobile app maker that attempts to safeguard users by, among other things, preventing them from texting while driving. Bieber also starred in a series of public service announcements tied to the company.
Great ideas are hard to come by. Putting them to work is even harder. Meet the founders who turned concepts into companies and changed the face of business.
