Tom DeMark, founder of Market Studies, Inc.

Tom DeMark, founder of Market Studies, Inc.

Ramona Rosales/Bloomberg Markets

Analyst Tom DeMark, shown here in the sports bar of his Scottsdale home with his son, has spent 40 years developing charts that call the markets' highs and lows. Hedge-fund moguls Steve Cohen and John Burbank are such fans, they bought a piece of the company.