| DVSc | 1995 | University of Queensland, Australia |
| DSc | 1996 | Australian National University, Australia |
| DSc | 1997 | University of Edinburgh, Scotland |
| DSc | 1997 | Tufts University, Medford, Massachusetts, USA |
| DMedSc | 1998 | Rhodes College, Memphis, Tennessee, USA |
| DPh | 1998 | Kyorin University, Japan |
| DSc | 1998 | Warsaw Agricultural University, Warsaw, Poland |
| DSc | 1999 | Latrobe University, Melbourne, Australia |
| DSc | 2000 | Imperial College, University of London, United Kingdom |
| DSc | 2000 | Autonomous University of Barcelona, Spain |
| DSc | 2000 | North Carolina State University, Raleigh-Durham, North Carolina, USA |
| DSc | 2001 | University of Guelph, Ontario, Canada |
| DSc | 2001 | University of Pennsylvania, Philadelphia, Pennsylvania, USA |
| DSc | 2001 | University of Bern, Bern Switzerland |
| DSc | 2002 | Michigan State University, Lansing, Michigan, USA |
| DSc | 2002 | University of Illinois at Urbana-Champaign, Urbana, Illinois, USA |
| DSc | 2003 | University of Technology, Sydney, Australia |
| DSc | 2008 | McGill University, Montreal |
| DSc | 2009 | University of Ghent, Belgium. |
| MD | 2012 | Universidad Peruana Cayetano Heredia, Peru |
| MD | 2012 | University of Dublin, Trinity College |
| LLD | 2012 | University of Melbourne |