Co-Leader: International Geoscience Program five-year project (IGCP-668) starting 2018 “Equatorial Gondwana History and Early Palaeozoic Evolutionary Dynamics”. IGCP projects by UNESCO and the International Union for Geological Sciences.
Sedimentary Geology Division of Geological Society of America: Selection committee for lifetime achievement Sloss Award (3-year term)
Geological Society of America Grants Committee, 1997-1999. Chairman, 1998-1999.
Past Corresponding Member of the Working Group on the Cambrian – Ordovician Boundary, International Union of Geological Sciences and International Geological Correlation Project.
Past Corresponding Member of the Working Group on the Precambrian – Cambrian Boundary, International Union of Geological Sciences and International Geological Correlation Project.
Past Member of the Working Group on the International Union of Geological Sciences and International Geological Correlation Project #303: Late Precambrian – Early Cambrian Event Stratigraphy.
Past corresponding Member of the International Union of Geological Sciences Working Group on the Terminal Proterozoic System.
Past corresponding Member of the International Union of Geological Sciences and International Geological Correlation Project #320: Neoproterozoic Events and Resources.
Member, Society of Economic Paleontologists and Mineralogists.
Member, Geological Society of America
Member, International Association of Sedimentologists
