中國工程院院士，中國農業大學動物科技學院院長，教授，博士導師，國家飼料工程技術研究中心主任。1989年獲美國堪薩斯州立大學動物營養學博士，致力于動物營養與飼料加工學的研究、教學、技術轉移、工程建設與人才培養工作。李院士是國內較早提倡將營養學和飼料加工工藝學有機結合的倡導人與開拓者，設計建造了我國高校和科技院所第一個集科研、生產、示范功能于一體的飼料中試基地。作為籌委會主任，創建國家飼料工程技術研究中心，擔負著我國飼料行業技術轉化和工程支持的重要任務。李院士極為重視人才培養和國際交流工作，培養博士后、博士50余名，碩士30余名，在12個國際會議和15個國外機構作學術報告40余次。

Prof. Li Defa is an academician of Chinese Academy of Engineering, Dean of College of Animal Science and Technology, China Agricultural University, and Director of National Feed Engineering Technology Research Center. In 1989, he got a doctor degree in animal nutrition from America Kansas State University. He was devoted to the research, teaching, technology transfer, engineering construction and talent training of animal nutrition and feed processing.
   Academician Li was the pioneer who advocated the organic integration of nutrition and feed processing technology in China, and designed and built the first feed pilot plant integrating scientific research, production and demonstration functions in China's universities and science and technology institutes. As the director of the preparatory committee, he created the National Feed Engineering Technology Research Center, which is responsible for the important task of technology transformation and engineering support in China's feed industry. Academician Li attaches great importance to the cultivation of talents and international exchange work, training more than 50 post-docs and PhDs, more than 30 masters, and giving more than 40 academic presentations in 12 international conferences and 15 foreign institutions.