Adam Trachtenberg is the Director of Platform and Services for eBay and is the author of two O'Reilly books, Upgrading to PHP 5 and PHP Cookbook.Adam has an MBA from Columbia Business School. While there, he focused on general management and operations, with an emphasis on the field of technology. Adam also has a BA from Columbia University. As an undergraduate he majored in mathematics, and his other studies included computer science and Chinese.