Michael Grote, professor for corporate finance at the Frankfurt School of Finance and Management, has become one of the leading experts on the financial crisis - and one of the most unconventional, as well. With his full beard and dreadlocks down to the backs of his knees, he hardly fits the stereotype image of a financial expert. His real specialty is mergers and acquisitions, and he’s one of the best in the field.   But the financial crisis has catapulted him into the role of expert for everything — and media star. Report by Bettina Thoma