Prof Xu is Thousand Talents Program professor (doctoral supervisor) of School of Nuclear Science and Technology. Prof Xu receibed his BSc. from Xidian University in 1983, and PhD. from Texas A&M University in 1994. He joined Rensselaer Polytechnic Institute in 1995 an assistant professor and director of Nuclear Security Office, and was promoted to be an associate professor (tenured) and professor in 2001 and 2006. In 2006, he was appointed as Program Head of Nuclear Engineering Program , leading 20 professors and 160 undergraduate and graduate students. His research interests cover radiation measurement and dosimetry. He is recognized as an international authority in the area of computational phantoms for Monte Carlo based radiation dose calculations for protection, imaging, and radiotherapy.