This report examines the life and career of John B. Griffing to understand the larger transnational project of rural development in the twentieth century. Griffing had an eclectic career that took him to various parts of the United States, China, and Brazil. While Griffing's papers are scattered across multiple institutions and countries, collections from the Rockefeller Archive Center (RAC) were particularly useful in tracing the evolution of Griffing's ideas about rural development over time. At least two themes emerge when studying his career. The first is his views on religion and rural development. As the son of a small-town dairy farmer and grandson of a Methodist minister, Griffing found a way to blend these two influences by working as an "agricultural missionary" where he promoted agricultural improvement as a tool for spreading Christianity in China. His later work in Brazil focused less on proselytizing but he continued to champion the rural church as an effective center for agricultural change. The second theme is Griffing's emphasis on extension work and the importance of reaching rural youth through programs such as 4-H clubs. For Griffing, club work (which focused mostly on boys) was an effective way to cultivate a form of rugged masculinity, while also spreading new agricultural crops and practices to their parents.