Shang Yuan REN pursued his graduate study with Professor Kun HUANG at Peking University(PKU), worked on theoretical semiconductor physics after  he  graduated  from  PKU  in  1963.   He  worked  with  Professor  Walter A. Harrison at Stanford University on theoretical solid state physics from 1978-1980, as one of earliest visiting scholars from P. R. China to the United States.  Then he worked as a research associate at University of  Missouri at Kansas City, University of Illinois at Urbana-Champaign.  He was back to the University of Science and Technology of China(USTC) in 1981 and worked as an associate professor and then a professor of physics at USTC. He worked as a visiting professor at University of Notre Dame, and a research professor at Arizona State University.  He joined PKU as a professor of physics since 1994.  He is now an emeritus professor at PKU. He  has  published  about  100  research  articles.   His  research  interests  include Low-Dimensional Physics, Theoretical Solid State Physics, Physics of Semiconductors/Semiconductor Devices, M¨obius Inversions and Their Applications  in  Science  and  Engineering,  Electronic  Structure  of  Biological Macromolecules.