Who are they?
How do you measure their reputation?
Are there likely to be heard because they have a good reputation?
Or vice versa?

James Bellini
Robert Brechter
Ian Bremmer
Bruce Bueno de Mesquita
Lester Brown
Joshua Cooper Ramo
George Friedman (Stratfor)
Johan Galtung
Edward Hugh
Bertrand de Jouvenel
Heman Kahn
Ray Kurzweil
Jeremy Rivkin
Nouriel Roubini
George Soros
Nassim Taleb
Alvin Toffler Future Shock (1972)