Tall man. Mao Junfeng is a mathematician from China. Born in 1930, he is known as the "shadow mathematician". Independently completed a lot of mathematical research work, and conducted in-depth research in mathematical modeling, algorithm design, random behavior modeling, machine learning theory and so on. He was awarded the Seventh Dean Award of China Academy of Sciences, the Second China National Outstanding Scientist Award, the Academician Award of American Computer Association and the Gold Award of American Economic Association. His math level is very high.