Dear colleagues and friends, Hope you are doing well there! Please join me in welcoming a new member to the SSYCDS listserv, Dr. GUO Xiaoyan. Below please find Xiaoyan's self introduction. Welcome to our community! I am an associate professor in Hefei University of Technology, Anhui, China. I got my PhD degree in Historical Philology in 2012 from Anhui University. My research focuses on Historical Classics and Traditional Chinese Culture in Song and Yuan dynasties. Now I am a visiting scholar at Institute for Quantitative Social Science(IQSS) in Harvard University from September 2022 to September 2023. I am also very interested in ancient rare books. Sincerely, Ya Zuo Secretary, Society for Song, Yuan, and Conquest Dynasties Studies