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In page John A. Church:

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Church has led a number of programs, including: CSIRO Division of Oceanography; Program Leader of the Oceanography Program of the Australian National Antarctic Research Expeditions; Project Leader, Southern Ocean Processes Project; CSIRO Division of Marine and atmospheric Research, Polar Waters Program, Antarctic Climate and Ecosystems Cooperative Research Centre. On an international level, Church has been the Principal Investigator for the NASA/CNES TOPEX/Poseidon Extended Satellite Mission.[citation needed]