Dr. Hai Qi received a Bachelor of Medicine from the Beijing Medical University in 1996 and a Ph.D. in Pathology from the University of Texas Medical Branch at Galveston in 2003. After postdoctoral training at NIH with Dr. Ronald Germain, in 2009 he joined the faculty of Tsinghua University, where he is currently a Professor in Immunology. His group studies follicular helper T (Tfh) cells and germinal center biology with a particular emphasis on cell-cell interactions, cell migration, and functional specialization. In this talk, Dr. Qi will present new findings on how territoriality and function of follicular helper T cells are regulated in the germinal center niche and how T cells impinge on the development of memory B cells.