Claude C. Hopkins (1866-1932) was one of the great advertising pioneers, he believed advertising existed only to sell something and should be measurable and justify the results that it produced.

He worked for various advertisers, including Bissell Carpet Sweeper Company, Swift & Company and Dr. Shoop’s patent medicine company. At the age of 41, he was hired by Albert Lasker owner of Lord & Thomas advertising in 1907 at a salary of $185,000 a year, Hopkins insisted copywriters researched their client products and produce reason-why copy. He believed that a good product was often its own best salesperson and as such he was a great believer in sampling.