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Before working at Macworld, Breen was contributing editor and Help Desk columnist for the US edition of MacUser magazine.
Breen is the author of several books, including Secrets of the iPod, The iPod and iTunes Pocket Guide, Mac 911, and My iMac. He has created a variety of video training courses for Lynda.com, including Mac OS X Leopard Essential Training, Screencasting for the Mac, iPad Tips and Tricks, and Lion Essential Training.
In February 2015 he resigned from Macworld to take an undisclosed job at Apple.