Ever wondered how the performance marketing industry got to where it is today? Heather Vale Goss of Performance Marketing Insider speaks with Todd Crawford, co-founder of Impact Radius and one of the “grandfathers” of the performance marketing industry. . In this exclusive interview, the first of two parts, discover how Todd got started in the industry and how it has changed over the years, as well as what’s involved in starting a major marketing company, how affiliate marketing became so powerful and why it had a rocky start, and the key differences between online and offline marketing.