Doberman Dan Gallapoo is a 30-year serial entrepreneur and direct response copywriter. He has worked in a variety of niches, but his specialty has been the health, fitness and bodybuilding markets. He's started four of his own nutritional supplement businesses and sold three of them. Publishing The Doberman Dan Letter since 2011, his subscribers include many influential marketers. He's also written successful ads, direct mail packages, websites, e-mail marketing campaigns and feature articles.