Harper was previously Professor of Palaeontology and Head of Geology in the
Natural History Museum of Denmark, University of Copenhagen. He has published over 10 books and monographs, and also over 250 scientific articles. He is co-writer, with Øyvind Hammer, of the software package PAST. In recent years he has been addressing some of the major events in the history of life, for example the Cambrian Explosion, Great Ordovician Biodiversification Event and the end Ordovician mass extinctions. His research programmes have taken him to many parts of the world including Chile, China, Greenland, Russia and Tibet. His research has been recognized by foreign membership of the
Royal Danish Academy of Sciences and Letters, an Einstein Professorship in the
Chinese Academy of Sciences and a D.Sc. from
Queen's University Belfast. Between 2011 and 2013 he was Deputy Head of Colleges (Research and Scholarly Activities) at
Durham university and served as Principal of
Van Mildert College between 2011 and 2021. == Selected publications ==