CAREER HIGHLIGHTS:
Felten is an expert in computer security and Internet software. He first attracted national attention in March, 1996, when he uncovered a serious security flaw in Java, the programming language developed by Sun Microsystems Inc. The bug enabled ill-intentioned hackers to lay a trap inside a Web site, then take control of computers once they entered the trap. Two months later, Felten and his Princeton team made news again when they demonstrated another Java security flaw that they found in Netscape's Navigator browser.

EXPECTED TO TESTIFY:
Felten could demonstrate for the court the interactions between Microsoft's Windows operating system and its Internet Explorer Web browser, which Microsoft argues has become an integral part of Windows. Justice Dept. prosecutors may also tap Felten's detailed knowledge of Netscape's Navigator in an effort to establish the technical breakthroughs that led to Netscape's early lead in the browser wars.