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(2017 Fall Visitors photo with Interim Department Chair in front of Umbilic Torus, from left 
DU Yunfei, LI Yanmei, NIE Dan, Wolf Schafer, Gang He, and ZHANG Tao)

(2017 Spring Visitors photo with Department Chair in front of Simons Center, from left 
HUI Jingxuan, BAI Hongtao, David Ferguson, Gang He, ZHANG Junfeng, and SUN Qian)

(2016 BNL visit with Grand Challenges class students)

(2015 Graduation)

(ERG faculty, Master's and PhD graduates 2015; Source: Zoe Anna)

(Google Clean Energy Visit with ERGies, Mountain View, 2010)

(UNFCCC CoP15, Copenhagen, 2009)

(Stanford University with PESD colleagues, Stanford, 2009)

(Columbia University with C&S friends, New York City, 2008; Credit: Arezou Paksima)

(Tallberg Forum, Sweden, 2007; Credit: JIA Feng)

(Yosemite National Park, 2007)

(Graduation from PKU with friends, Beijing, 2006)

(UNFCCC CoP11, Montreal, 2005)