Liang Liu, Ph.D., professor of Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences. His main research interests include cold atom physics and cold atom clocks in space. Dr. Liu received his Bachelor of Science from East China Normal University in 1982, Master of Science from Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences in 1985, and Doctorate from State University of New York at Stony Brook in 2000. He is the Chief Designer of CACES in Tiangong-2, Chief Designer of CAPR in the China Space Station, and Chief Designer of CCAC in Beidou, and he has made many significant contributions in space cold atom physics and its applications in GNSS. Dr. Liu received Second Rank of Science and Technology Progress Award of the Chinese Academy of Sciences in 1988, Zeng Xianzi Space Prize in 2017, Time and Frequency Outstanding Achievement Award in 2019, Outstanding Science and Technology Achievement Prize of the Chinese Academy of Sciences in 2020, and the Science Prize of the Chinese Society of Space Research in 2022. He published more than 150 papers and 20 patents.