D. H Vaild Vaild is an author who is interested in marketing because of the need of working environment. He 1922 went to the University of Minnesota, worked in the Department of Economics for one year, and then went to the Agricultural College, because he was in urgent need of knowledge about how to make Minnesota products enter the market. Farmers are very interested in marketing, so Wilder spent a lot of time studying the marketing process of products and teaching the course of agricultural marketing after leaving the farm. At the University of Wisconsin, Taylor and Hibbard also teach farm management courses. 19 13 years, when wilder was talking about this course, there was no teaching material in this field, so he had to rely on his own knowledge to develop this course. He studied the grain circulation process and futures trading operation of Minneapolis Chamber of Commerce. His findings were reported to the Marketing Bureau of USDA, but they were not published. In order to collect information about the marketing process, Wilder even actually tracked the whole transportation process of butter and eggs, and inspected enterprises (such as wholesalers and retailers) passing through marketing channels in new york and Chicago. He also investigated pricing methods, commodity exchanges, auction markets and Minnesota United Transportation Association. Through these investigation activities, on the one hand, he has increased his knowledge and talent in marketing teaching; On the other hand, it also developed its own marketing ideas, and then published the book "Agricultural Products Marketing" (19 16). After that, he taught at the Sheffield Academy of Sciences of Yale University for two years and continued to engage in marketing research. At this time, his research interest has turned to industrial products. Another meaningful thing during this period is the big gathering of marketing teaching staff. 19 14 Vaild was lucky enough to read his paper "Marketing" at the American Economic Association, which was the first time that the topic of marketing was made public. Four years later, at the same meeting in Richmond, he discussed teaching problems with five or six people interested in marketing. This small group meets once a year and grows rapidly, becoming the core of the National Marketing Teachers Association.