Earl Boysen is a veteran engineer who maintains two technology-focused websites, www.buildinggadgets.com and www.understandingnano.com. He is coauthor of the first edition of Electronics For Dummies as well as Electronics Projects For Dummies and Nanotechnology For Dummies, all published by Wiley.

The late Harry Kybett wrote the bestselling first and second editions of Electronics Self-Teaching Guide. He was director of engineering operations at Columbia Pictures Corporation. He built many studios and video systems for the broadcasting industry, and created training programs for Sony Corporation of America.