J. C. Sun joined "the North China Star" in Tientsin, China in 1920. Then he worked as an English translator of Chung Mei News Agency, Peking and later editor of its translation service in 1920-1922. After that he held a position of night sub-editor of the Peking Leader in 1920.
In 1921 Mr. Sun started a student English paper, the Peking Express and edited it for one year. He also was a news editor of the North China Standard from March, 1922 to January 1, 1930, when he joined the Leader in a similar capacity. He started the English service of the Kuo Wen News Agency in 1925 and was editor since that time. After that he became also connected with the Peiping Bureau of Renter's Service.