388. James Clark
$2 billion Self-made Score: ( Source: netscape, investments age: 73 residence: palm beach, fla. Ph.d., u. of utah ’74 Kicked out of school as a teenager, Clark enlisted in the Navy, where he ran a business making loans to other soldiers. After his discharge, he got bachelor’s and master’s degrees in physics from the University of Louisiana (then called Louisiana State University at New Orleans) and a computer science PH.D. from the University of Utah. He spent 5 years as an electrical-engineering professor at Stanford, started 3-D graphics giant Silicon Graphics in 1982 and cofounded Netscape with Marc Andreessen (now a billionaire) in 1994. His latest startup, Commandscape, seeks to help automate and secure homes.