In 1993, as a graduate student, he co-wrote NCSA Mosaic for
Windows with fellow student
Chris Wilson while working at the
National Center for Supercomputing Applications (NCSA). Mittelhauser was part of the original team of five programmers of Mosaic with
Marc Andreessen and
Eric Bina (
Unix version),
Aleks Totic (
Mac version) and Chris Wilson (Windows version). The Windows version that Mittelhauser and Wilson wrote was the first
browser with over a million downloads and is often characterized as the first widely used web browser. Mittelhauser is considered a founding father of the browser. After leaving the University of Illinois in 1994, Mittelhauser became one of the founders of
Netscape Communications Corporation. Mittelhauser led the software organization at
OnLive, Inc. and managed their successful launch in 2010. From December 2014 to December 2016, he was chief executive officer of the software company that develops
CloudBolt. he was Vice President of the Container Native Group at
Oracle Corporation. ==Personal life==