Glenn Krasner cofounded the Smalltalk spin-off ParcPlace Systems, where he held many positions including Vice President of Engineering. He started his career at Xerox PARC as听a student research intern in the Learning Research Group, and then was a software engineer at Tektronix for two years. Returning to PARC and LRG, Krasner听worked on the Smalltalk system and implementations. He coordinated the project where groups from a number of companies and universities implemented the Smalltalk-80 system on a variety of platforms to ensure portability.听Krasner听别诲颈迟别诲 Smalltalk-80: Bits of History, Words of Advice, a collection of papers from these groups as well as LRG members describing their implementation projects. He also became a group manager at PARC.听Krasner听was听Vice Chair of the committee that created the ANSI Smalltalk Standard.听