David Wertheimer is an Internet strategist and business builder with expertise in ecommerce, digital media, user experience and marketing.

In 15 years online, David has accumulated diverse experience ranging from editorial to information architecture to marketing. As Director of Strategy for Alexander Interactive, he leads the company's strategic initiatives, from business positioning to data analysis, and provides focus and vision to Ai's projects. Past achievements include creating world-class media websites for The Economist and Billboard magazines and leading 200% growth in online retail sales as the marketing director for Clarins USA. He has also worked in consulting roles for a wide range of companies including Yahoo! HotJobs, Draftfcb and Rodale.

David is an internationally recognized public speaker and published author on ecommerce and usability topics. His Ideapad, launched in 1998, is one of the world's oldest continually publishing blogs.

David has an MBA from the New York University Stern School of Business and a bachelor's degree from Franklin & Marshall College. He lives in Manhattan with his wife, their son and their dog.