Yuan-Sen is a graduate student working with Dr Alexey Vikhlinin and Prof. Christopher Stubbs. He is analyzing data from the NASA Chandra X-ray observatory to understand how often galaxy clusters merge. He is also very interested in galactic dynamics, and plans to dissect the formation of the Milky Way via the motions and elemental abundances of stars in the Milky Way. He loves public outreach activities and has developed new educational tools for teaching. Yuan-Sen is pictured here presenting at the Boston Museum of Science.