| Vaughan F. R. Jones | Univ. California, Berkeley | 7/1990 | |
| Adrian Ocneanu | Pennsylvania State University | 7/1990 | |
| David E. Evans | Univ. College Swansea | 2/1991 | |
| Ola Bratteli | Univ. Oslo | 5/1991 | |
| Masamichi Takesaki | UCLA | 9-12/1992 | |
| David E. Evans | Univ. College Swansea | 7/1994 | |
| Ken Dykema | Fields Institute | 2/1995 | |
| Florin Radulescu | Univ. Iowa | 9/1995 | |
| Florin Radulescu | Univ. Iowa | 2/1996 | |
| Florin Boca | Univ. Wales Swansea | 5/1996 | |
| Phan Hung Loi | Wright State Univ. | 12/1996 | |
| Roberto Longo | Univ. Rome | 6/1997 | |
| Zhong-Jin Ruan | UIUC | 6/1997 | |
| Masamichi Takesaki | UCLA | 6/1997 | |
| N. Christopher Phillips | Univ. Oregon | 6/1997 | |
| George Elliott | Univ. Toronto | 7/1997 | |
| Alex Kumjian | Univ. Nevada, Reno | 7/1997 | |
| Carl Winslow | Univ. Copenhagen | 7/1997 | |
| Uffe Haagerup | Odense Univ. | 1/1998 | |
| Philippe Biane | Ecole Normale Superieure/CNRS | 4/1998 | |
| Flemming Larsen | Odense Univ. | 5-7/1998 | |
| Sergei Silvestrov | Royal Institute of Technology, Sweden | 5-6/1998 | |
| Nathanial Brown | Purdue Univ. | 6/1998-5/1999 | |
| Feng Xu | UCLA | 6/1998 | |
| David E. Evans | Univ. Wales Cardiff | 7/1998 | |
| Masamichi Takesaki | UCLA | 7/1998 | |
| Ryszard Nest | U. Copenhagen | 10/1998 | |
| Dietmar Bisch | UC Santa Barbara | 3-4/1999 | |
| Wojciech Szymanski | U. Newcastle | 3/1999 | |
| Jens Bockenhauer | Univ. Wales Cardiff | 5/1999 | |
| David E. Evans | Univ. Wales Cardiff | 5/1999 | |
| Karl-Henning Rehren | U. Goettingen | 8-9/1999 | |
| John E. Roberts | Univ. Rome | 1/2000 | |
| Anthony Malerich | University of New Mexico | 6-8/2000 | |
| Carl Winslow | Royal Danish School of Educational Studies | 7/2000 | |
| David Kerr | University of Toronto | 10/2001-9/2002 | |
| Detlev Buchholz | Univ. Goettingen/RIMS | 11/2001 | |
| Stanislaw Woronowicz | Warsaw University | 8-9/2002 | |
| Nicolas Lim | Ecole Normale Superieure | 10/2002-3/2003 | |
| Sergei Neshveyev | Univ. Oslo | 2/2003 | |
| Ryszard Nest | Univ. Copenhagen | 3/2003 | |
| Rolf Dyre Svegstrup | Univ. Copenhagen | 4/2003- | |
| Hsiang-Ping Huang | Center for Theoretical Sciences, Taiwan | 4/2003 | |
| Gilles Pisier | Paris VI/Texas A&M | 4/2003 | |
| Srinivasan Raman | Indian Statistical Institute | 10/2003-9/2004 | |
| Nathanial Brown | Pennsylvania State University | 12/2003-1/2004 | |
| Huaxin Lin | Univ. Oregon | 12/2003 | |
| Nicolas Lim | Ecole Normale Superieure | 4/2004-3/2005 | |
| Seung-Hyeok Kye | Seoul National Univ. | 5/2004 | |
| Florin Radulescu | Univ. Rome/Univ. Iowa | 6/2004 | |
| Piotr Sniady | Univ. Wroclaw | 9/2004 | |
| Alfons Van Daele | K. U. Leuven | 9/2004 | |
| Sebastiano Carpi | Univ. Chieti-Pescara | 10/2004 | |
| N. Christopher Phillips | Univ. Oregon | 4/2005 | |
| Erik Guentner | Univ. Hawaii | 5/2005 | |
| George Elliott | Univ. Toronto | 5/2005 | |
| Pinhas Grossman | UC Berkeley | 7-8/2005 | |
| Man-Duen Choi | Univ. Toronto | 10/2005 | |
| Rajendra Bhatia | Indian Stat. Inst. | 10/2005 | |
| Sebastiano Carpi | Univ. Chieti-Pescara | 11/2005 | |
| Raphael Ponge | Ohio State University | 11-12/2005 | |
| Nathanial Brown | Pennsylvania State University | 12/2005 | |
| Mihaly Weiner | Univ. Rome | 1/2006 | |
| Detlev Buchholz | Univ. Goettingen | 6/2006 | |
| George Elliott | Univ. Toronto | 7/2006 | |
| Claude-Alain Pillet | Universite de Toulon et du Var | 9/2006 | |
| Masamichi Takesaki | UCLA | 11/2006 | |
| Roberto Longo | Univ. Rome | 12/2006-1/2007 | |
| Benoit Collins | Univ. Claude Bernard Lyon 1 | 12/2006 | |
| Dan Voiculescu | Univ. California, Berkeley | 5/2007 | |
| Marta Asaeda | Univ. California, Riverside | 5/2007 | |
| Richard Burstein | Univ. California, Berkeley | 6-8/2007 | |
| Gandalf Lechner | Erwin Schroedinger Institute | 10/2007 | |
| Pinhas Grossman | Vanderbilt University | 12/2007 | |
| Rune Johansen | University of Copenhagen | 4-6/2008 | |
| David Kerr | Texas A&M University | 6/2008 | |
| George Elliott | Univ. Toronto | 7/2008 | |
| Yves de Cornulier | ENS | 9/2008 | |
| Cyril Houdayer | UCLA | 9/2008 | |
| Emily Peters | Univ. California, Berkeley | 10/2008 | |
| Scott Morrison | Univ. California, Santa Barbara | 10/2008 | |
| Stefaan Vaes | K. U. Leuven | 1/2009 | |
| Alin Ciuperca | Univ. Toronto | 1/2009 | |
| Zhuang Niu | Univ. Oregon | 1/2009 | |
| Srinivasan Raman | Chennai Math Institute | 1-2/2009 | |
| Troels Steenstrup Jensen | Univ. Southern Denmark | 1-2/2009 | |
| Giuseppe Ruzzi | Univ. Rome | 1-2/2009 | |
| Ezio Vasselli | Univ. Rome | 1-2/2009 | |
| Claudio D'Antoni | Univ. Rome | 1-2/2009 | |
| Sebastien Falguieres | K. U. Leuven | 1-2/2009 | |
| Vaughan F. R. Jones | Univ. California, Berkeley | 1-2/2009 | |
| Dietmar Bisch | Vanderbilt Univ. | 4/2009 | |
| Chris Heunen | Radboud Universiteit Nijmegen | 6/2009 | |
| Ingo Runkel | King's College London | 7/2009 | |
| Marek Bożejko | University of Wrocław | 9/2009 | |
| Adam Skalski | Lancaster University | 10-11/2009 | |
| Robert Coquereaux | CNRS/CPT, Marseille | 10/2009 | |
| David Kerr | Texas A&M University | 12/2009-1/2010 |
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