Dr. Ellen Xiaoxia Xu (许晓霞): Ellen has joined Chevron after working for ExxonMobil for over 7 years. She was recognized inside ExxonMobil and outside for her various projects related to geophysical applications. Her 4D intern work for BP during the summer of 2004 was also highly rated by the company. Ellen had earned her PhD degree in Geophysics from Colorado School of Mines and M.S. in Geology from the University of Illinois at Urbana-Champaign. She has published more than 10 peer-reviewed papers and hold two pending patents. Over the years, she enjoyed many geology fieldtrips as a geophysicist and take that as a hobby in addition to raising two kids with her husband.