D. at Stanford University, where he was laboring in the seemingly obscure field of haptics, or the science of touch.

FORBES: Desktop fingerprints

D. from Stanford University's engineering and economic systems department, is less charitable when it comes to companies with speculative business models, especially those carrying a large debt load.

FORBES: Magazine Article

D. in philosophy from Stanford University, also holds 6.5 million shares of Overstock.

FORBES: Who Got Rich This Week: A Philosopher, A Biotech Businessman And More