The Origins Laboratory of the Department of the Geophysical Sciences and the Enrico Fermi Institute at the University of Chicago seeks applicants for a postdoctoral scholar position in isotopic geochemistry-cosmochemistry. Although different backgrounds will be considered, experience in clean laboratory procedures and multicollector inductively coupled plasma mass spectrometry (MC-ICPMS) techniques is especially desirable. The postdoc could work on any of the multiple research topics that are currently studied in our laboratory, including igneous processes responsible for enrichments in critical elements of magmas and minerals, origin of the depletion in moderately volatile elements of planetary bodies, iron biogeochemistry, studies of asteroid samples returned to Earth by space mission