2007 Apr 18 - Bernhard Schmidt, Nanyang Technological University (Singapore) 2007 Apr 18 - Bernhard Schmidt, Nanyang Technological University (Singapore) 2016 Sept 30 - Richard Guy Day 2016 Sept 30 - Richard Guy Day 2017 Mar 31 - William Martin, Worcester Polytechnic Institute 2017 Mar 31 - William Martin, Worcester Polytechnic Institute
