· Vice-Chair of the Department of Geophysics, UC San Diego2017–
· Deputy Director for Research and Associate Vice Chancellor for Marine Sciences, Scripps Institution of Oceanography, UC San Diego2009–
· Director of Cecil H. and Ida M. Green Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, UC San Diego2007–
· Head of Earth Section, Scripps Institution of Oceanography, UC San Diego2006–
· Professor of Geophysics, Scripps Institution of Oceanography, UC San Diego1987–