1916-1917: Arrived in China in May for second sojourn. Together with Robert Fitch and J.H. Arthur, traveled up the Yangzi River, from Zheijiang province deep into Sichuan province, taking numerous photographs.
1918 Spring: Visited flood relief camps in Tianjin and traveled to Beijing. Traveled with G. Sherwood Eddy to Xiamen, Fuzhou, Ningbo, Hong Kong, and Manila. Joined the international staff of the YMCA in Beijing and became a member of Princeton University Center in China (Princeton Court).
1918 Summer: Visited Beidaihe and Bei Niu Ding (Hebei).
1918 Fall: Conducted field-work for a social survey of Beijing with John Stewart Burgess while teaching elementary economics and the principles of philanthropic and institutional work at Yenching University.
1919 Spring: Visited Baoding and Kaifeng during Spring Festival, and Taishan, Jinan, and Qufu in March.
1919 Summer: Worked on survey materials at Beidaihe.
1919 Fall: Traveled to Hangzhou.
1919 Winter: Returned to Pasadena, California, in December, with negatives of some 2,500 photographs taken during second sojourn.
1921: Published first book, Peking: A Social Survey, with the assistance of J. Stewart Burgess. Traveled as member of a commission headed by G. Sherwood Eddy to study the labor movement in England and relief work in Germany, Austria, and Czechoslovakia.
1922-1923: Prepared for third sojourn in China at New York Union Theological Seminary, New York School of Social Work, and Columbia University.
1931 Summer: Returned to China for fourth and last sojourn, following a second trip to the Soviet Union. Became involved in the administration of Yenching University.
1931 Fall: Moved Dingxian to serve as research secretary of the National Association for the Mass Education Movement, and carried out surveys of village life in northern China.
1932 Spring: Departed Shanghai for the United States on February 23.
1933: Published How Chinese Families Live in Peiping.
1934-1968: Continued to publish books and articles on aspects of Chinese village and family life. Elected member of the National Council of the YMCA. Became Treasurer, Vice Chairman, Chairman, and President Emeritus of Church World Service; Chairman of the Executive Committee of the Josiah Macy, Jr. Foundation; President and Honorary Chairman of Princeton-in-Asia.
1968: Died in New York on March 29 at the age of 78, survived by his widow and four children; Catherine, Louise, David, and Anne.