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Tim Isted has been writing software for Macintosh computers since 1995. He also builds web applications using Ruby on Rails, PHP, and .NET, and has been known to develop for Windows machines, too. Also a professional musician and singing teacher, he tries to divide his time fairly equally between conducting, accompanying, teaching, and writing software. He blogs on Core Data at www.timisted.net, and is currently co-organizing NSConference, a European conference for Mac developers.