While everybody thinks “Steve Jobs” when asked about the Mac, few people know the engineers, programmers and designers behind the Macintosh project. Andy Hertzfeld, born ’53, was in the small, handchosen circle of employees who started to work on the Macintosh at the beginning of the 80’s. Hertzfeld played a major part in the development of the Mac OS. Since 2005, he has been working at Google. While the Mac turns 25, we had the chance to interview him about then and now.