Online advertising expert David Szetela is Owner and CEO of Clix Marketing, one of the few agencies that specializes exclusively in pay-per-click (PPC) advertising, creating and optimizing clients Google AdWords, Yahoo! Search Marketing and Microsoft adCenter advertising campaigns. Clix is also one of the few agencies paid according to their performance  as a percentage of profit or a commission per sales lead generated. Szetela's 25+-year career working for small magazine publishers as well as Apple Computer and Ziff-Davis Publishing has provided him deep experience in direct response marketing. He is active in the Search Engine Marketing Professional Organization (SEMPO) and is one of the authors of SEMPOs Advanced Search Advertising course. His articles on PPC advertising have been published in MediaPost, Search Engine Land, MarketingSherpa, on his company's blog, in his weekly Profitable PPC column published by Search Engine Watch, and in the SEW blog. He is the Principal PPC Editor of the paper and online publication SEMJ.org. He is also a frequent speaker at Search and Advertising industry events like Search Engine Strategies, SMX, PPC Summit and ad:tech, and he hosts a weekly radio show called PPC Rockstars, distributed by Webmasterradio.fm and iTunes. His Wiley/Sybex book PPC Advertising on One Hour a Day will be published in January 2010.