Dear Colleagues, Please follow this link<https://www.si.edu/content/ohr/SITrustVacs/SITRUST-23-NMNH0414.pdf> (https://www.si.edu/content/ohr/SITrustVacs/SITRUST-23-NMNH0414.pdf) for three postdoctoral research opportunities at the Smithsonian's National Museum of Natural History. These full-time temporary appointments require a PhD and are each renewable for up to three (3) years upon satisfactory performance. We are hiring one position in each of the following three areas: (1) Life and Minerals - study sedimentary sequences that span the time of the Great Oxidation Event (around ~2.3 billion years ago) to identify magnetofossils, or other fossil evidence of iron-biomineralizing microorganisms. (2) Continents - use the trace element and isotopic compositions of ancient rocks and minerals to investigate the evolution of the early Earth and the onset of modern-style plate tectonics. (3) Oceans – conduct petrologic and mineralogical study of aqueously-altered carbonaceous chondrites and samples returned by the OSIRIS-REx mission to understand their history and the potential to deliver water to early Earth. Applicants should include: (1) a cover letter expressing their interest and applicability for the position; (2) their curriculum vitae (CV); (3) names and contact information for three referees; (4) a research statement; (5) a statement of how the candidate will enhance the diversity, equity, accessibility and inclusivity of the Museum; and (6) any other qualifications the candidate sees as relevant to the position. Applications must be received by May 22nd at 5 PM EST and must be sent to: NMNHStaffing@si.edu with the subject "Research Geologist/Biologist." Feel free to contact Tim McCoy (mccoyt@si.edu) with any questions, but please note that any applications not sent to the above email address will not be considered. Sincerely, Gabriela Gabriela A. Farfan, Ph.D. Coralyn Whitney Curator of Gems and Minerals SMITHSONIAN INSTITUTION, NMNH