Mittelhauser attended the University of Illinois at Urbana-Champaign, where he joined the Alpha Sigma Phi fraternity and graduated with a Bachelor of Science degree in Computer Science in 1992 and a master's degree in 1994.
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.
Mittelhauser led the software organization at OnLive, Inc. and managed their successful launch in 2010. He left at the end of that year as VP of Engineering and joined their Technical Advisory Board.
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