Johnson is a doctor of veterinary medicine in the University of Illinois. He has been worked at the University of Illinois, the American Soybean Association, Ministry of Agriculture Feed Industry Center, and the Guangdong Pig Industry Association. He was one of the co-founders of the Agricultural Animal Research Institute of the University of Illinois.
     1987-Nov. 1996, consultant on pig farming in the United States.
     Dec. 1996-Mar. 1999, foreign visiting scholar, Ministry of Agriculture Feed Industry Center, China Agricultural University.
     2001-2003, agricultural veterinarian, University of Illinois at Urbana.
     2003-2010, animal research and production consultant in Urbana, Illinois
     2010-2012, technical service expert at BJ-EFEV, serving customers at domestic and abroad
     Aug.2012-now, Senior Technical Consultant at Enable AgTech Consulting co., Ltd, providing technical services and training for a number of domestic pig enterprises.
     His cooperation units including: U.S. Grain Council, Guangdong Pig Industry Association (the main contract), the American Soybean Association, PICCHINA (zhangjiagang), Charoen Pokphand Group, COFCO Corporation, the AgfeedGroup, Besun Agricultural Industry, Hainan Yuchang Group etc. His main work focuses on education and training in southern China.