中国工程院院士，中国农业大学动物科技学院院长，教授，博士导师，国家饲料工程技术研究中心主任。1989年获美国堪萨斯州立大学动物营养学博士，致力于动物营养与饲料加工学的研究、教学、技术转移、工程建设与人才培养工作。李院士是国内较早提倡将营养学和饲料加工工艺学有机结合的倡导人与开拓者，设计建造了我国高校和科技院所第一个集科研、生产、示范功能于一体的饲料中试基地。作为筹委会主任，创建国家饲料工程技术研究中心，担负着我国饲料行业技术转化和工程支持的重要任务。李院士极为重视人才培养和国际交流工作，培养博士后、博士50余名，硕士30余名，在12个国际会议和15个国外机构作学术报告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.