Many professionals and executives have left jobs to start their own businesses in fields that have nothing whatsoever to do with their previous post. For example, the anthropology professor who started a cleaning service, or the corporate executive who began driving a lunch truck and wowing hungry street crowds with his cooking skills: gourmet Belgian waffles. A recent example of this kind of breed of entrepreneur is Big Man Bakes, featured on CNN. Chip Brown left medical school to open his own bakery.
Lesson: According to aptitude research, primary skills, left unused, become hard to ignore with time. People are often tapping into strong idled skills when they take the entrepreneurial path.