Bob LeVitus (Austin, Texas) often referred to as "Dr. Mac," has written 39 computer books, including all previous editions of Mac OS For Dummies. His books have sold more than a million copies worldwide. Bob presently has a weekly newspaper column "Dr. Mac" in the Houston Chronicle. (Readership 1 million+) He's also been published in more than two-dozen computer magazines over the past thirteen years. Always a popular speaker at computer user groups and trade shows, Bob has spoken at more than 200 seminars here and abroad, presented keynote addresses in three countries, and produced a series of training seminars in five cities.