Every page in the foundations section of my direct response knowledge base.
The four teachers whose work shaped how I think about direct response: Claude Hopkins, Dan Kennedy, Gary Halbert, and Alex Hormozi. A short page of credit, then I mostly get out of the way.
The 1923 classic on scientific advertising is the foundational document of direct response. Its central claim: advertising is not art, it's a measurable science, and the measurement is what turns guesses into profits.
The ten rules are the scaffolding of modern direct response. Violate any one of them and the campaign leaks money. Follow all ten and the campaign runs itself.
Direct response is advertising that demands a measurable response from a specific person. Here's what separates it from brand advertising, and why almost every profitable marketing campaign since 1900 has been direct response.