Wu-Yi Hsiang is a Professor Emeritus in the Department of Mathematics at the University of California, Berkeley. His research interests include transformation groups and differential geometry. Hsiang has co-authored several significant publications, particularly in the area of celestial mechanics and the geometry of three-body motions. His work employs an equivariant Riemannian geometric approach to analyze the complex dynamics of celestial bodies. Significant contributions include studies on global geometry of three-body motions and kinematic geometry in the context of celestial mechanics. Hsiang has published in various renowned mathematical journals and has a strong reputation in his field for advancing the understanding of geometric frameworks and their applications to physical systems.