She is considered one of the foremost eBay experts and educators in the world and the top-selling author. In 1999 Marsha created the first edition of eBay For Dummies, the bestselling book for eBay beginners. She followed up the success of the first book with Starting an eBay Business For Dummies, a book targeting individuals interested in making e-commerce their full-time profession. That book became an instant nationwide hit, making several notable best-seller lists. These books are updated regularly to keep up with site and market changes.