Avadis "Avie" Tevanian is an American computer scientist. He was senior vice president of software engineering at Apple from 1997 to 2003, and then chief software technology officer from 2003 to 2006. He was a long-standing friend of Steve Jobs.
Earlier in his career, Avie was Vice President of Software Engineering at NeXT Computer and was responsible for managing NeXT's software engineering department and the NeXTSTEP operating system. Avie holds a B.A. in mathematics from the University of Rochester and earned his M.S. and Ph.D. degrees in computer science from Carnegie Mellon University. While at Carnegie Mellon, he was a principal designer and engineer of the Mach operating system, on which OS X and iOS are based. 
Tevanian is from Westbrook, Maine. He has a B.A. in mathematics from the University of Rochester, and M.S. and Ph.D. degrees in computer science from Carnegie Mellon University. In United States v. Microsoft, he was a witness for the United States Department of Justice, testifying against Microsoft.
Tevanian left Apple on March 31, 2006, and joined the board of Dolby Labs. In May 2006, he joined the board of Tellme Networks, which was later sold to Microsoft. On January 12, 2010, he became managing director of Elevation Partners. In July 2015 he co-founded NextEquity Partners and is currently serving as Managing Director.
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