| Steve McKay , Department of Philosophy, Sherbrooke University, , Canada, July 8, 2008 |
| Jurgen Koenig , Bochum University, Germany, Bochum, Germany, May 24-27, 2008 |
| Mustafa Omar , University of Salahaddin, Erbil, Iraqi , Arbil, Iraq, May 20-23, 2008 |
| Joan Simon , University of Edinburgh, School of Mathematics, Edinburgh, United Kingdom, May 14-24, 2008 |
| Yolanda Lozano , University of Oviedo, Department of Physics, Oviedo, Spain, April 28 - May 2, 2008 |
| Quassim cassam , University of Cambridge, , England, April 15-18, 2008 |
| Mahdi Sargolzaei , Dresden University of Technology, Dresden, Germany, March 24 - May 21, 2008 |
| Omid Saremi , McGill U., Canada, Quebec, Canada, March 8 - May 16, 2008 |
| Alok Kumar , Institute of Physics, Bhubaneswar, India, Jan. 1 - Feb. 1, 2008 |
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