Lizhen Ji is a professor of mathematics at the University of Michigan, USA, and studies subjects related to Lie groups, discrete subgroups of Lie groups, transformation groups, and related spaces. He loves books and is a chief editor of four book series: Advanced Lectures in Mathematics, Mathematics and Humanities, Panorama of Mathematics, and Surveys of Modern Mathematics. He is a chief editor of the journal Pure and Applied Mathematics Quarterly, and an editor of the Asian Journal of Mathematics and the journal Science in China: Mathematics. He was a Sloan Fellow and received the NSF postdoctoral Fellowship and the Morningside Silver Medal of Mathematics. He enjoys listening to good mathematics talks on diverse topics. He has organized over 30 summer schools, conferences, and workshops, and is an active organizer of seminars and colloquia.