Ellen Finkelstein has been using PowerPoint since 1996. She is the author of How to Do Everything with Microsoft Office PowerPoint 2007, published by McGraw-Hill/Osborne (and earlier editions for PowerPoint 2002 and 2003). She maintains a website of free PowerPoint tips, where you're invited to sign up for her free PowerPoint Tips Newsletter. Ellen has written numerous articles about PowerPoint. Her latest books are PowerPoint for Teachers: Dynamic Presentations and Interactive Classroom Projects, published by Jossey-Bass/Wiley, 101 Tips Every PowerPoint User Should Know, and 7 Steps to Great Images. She leads seminars and webinars that teach audiences to improve their PowerPoint and presenting skills.