| April 25 - 29, 2012 | (hosted jointly with Cornelius Pillen and Yorck Sommerhäuser) Paul-Hermann Zieschang, University of Texas at Brownsville |
| April 4 - 7, 2012 | (hosted jointly with Cornelius Pillen and Yorck Sommerhäuser) Abdenacer Makhlouf, Université de Haute Alsace, France & University of South Florida |
| March 22 - 24, 2012 | (hosted jointly with Cornelius Pillen and Yorck Sommerhäuser) Ha Nguyen, Georgia Southern University |
| November 30 - December 2, 2011 | (hosted jointly with Cornelius Pillen and Yorck Sommerhäuser) Marcelo Aguiar, Texas A&M University |
| November 14 - 15, 2011 | (hosted jointly with Cornelius Pillen and Yorck Sommerhäuser) Gene Abrams, University of Colorado at Colorado Springs |
| October 27 - 28, 2011 | (hosted jointly with Cornelius Pillen and Yorck Sommerhäuser) Mahir Can, Tulane University |
| March 30 - April 1, 2011 | (hosted jointly with Cornelius Pillen and Yorck Sommerhäuser) David Hemmer, University at Buffalo, SUNY |
| September 9 - 11, 2010 | (hosted jointly with Cornelius Pillen and Yorck Sommerhäuser) Robert Wilson, Rutgers University |
| August 25 - 28, 2010 | (hosted jointly with Cornelius Pillen and Yorck Sommerhäuser) Sandra Spiroff, University of Mississippi |
| November 4 - 7, 2009 | (hosted jointly with Cornelius Pillen and Yorck Sommerhäuser) Eric Rowell, Texas A&M University |
| October 21 - 24, 2009 | (hosted jointly with Cornelius Pillen and Yorck Sommerhäuser) Christopher Drupieski, University of Georgia |
| March 5 - 9, 2009 | (hosted jointly with Cornelius Pillen and Yorck Sommerhäuser) Gabriele Nebe, RWTH Aachen, Germany |
| January 29 - 30, 2009 | (hosted jointly with Cornelius Pillen and Yorck Sommerhäuser) Lars Kadison, University of Pennsylvania |
| October 29 - 31, 2008 | (hosted jointly with Yorck Sommerhäuser) Roozbeh Hazrat, CUNY & Queen's University, Belfast, UK |
| October 11 - 15, 2008 | (hosted jointly with Cornelius Pillen and Yorck Sommerhäuser) Frank Lübeck, RWTH Aachen, Germany |
| September 17 - 20, 2008 | (hosted jointly with Cornelius Pillen and Yorck Sommerhäuser) Sarah Witherspoon, Texas A&M University |
| April 17 - 19, 2008 | Thomas Michael Keller, Texas State University |
| February 28, 2008 | Jaromy Kuhl, University of West Florida |
| September 6 - 7, 2007 | Karl Heinrich Hofmann, Darmstadt University of Technology, Germany & Tulane University |
| March 29 - 30, 2007 | Robert Underwood, Auburn University-Montgomery |
| March 22 - 24, 2007 | Yorck Sommerhäuser, University of Cincinnati |
| March 4 - 6, 2007 | (hosted jointly with Cornelius Pillen) Julia Pevtsova, University of Washington |
| February 21 - 24, 2007 | Ian Musson, University of Wisconsin-Milwaukee |
| February 15 - 16, 2007 | Tin-Yau Tam, Auburn University |
| November 30 - December 1, 2006 | (hosted jointly with Abhijit Champanerkar and Cornelius Pillen) Pramod Achar, Louisiana State University |
| October 5 - 7, 2006 | (hosted jointly with Stephen Brick and Cornelius Pillen) Jon Corson, University of Alabama |
| April 5 - 8, 2006 | (hosted jointly with Cornelius Pillen) James Humphreys, University of Massachusetts at Amherst |
| March 23 - 25, 2006 | (hosted jointly with Cornelius Pillen and Xin-Min Zhang) Zongzhu Lin, Kansas State University |
| January 19 - 20, 2006 | (hosted jointly with Cornelius Pillen) Martin Evans, University of Alabama |
| October 26 - 27, 2005 | (hosted jointly with Cornelius Pillen) Huajun Huang, Auburn University |
| October 12 - 15, 2005 | (hosted jointly with Cornelius Pillen) Jonathan Kujawa, University of Georgia |
| September 29 - 30, 2005 | (hosted jointly with Cornelius Pillen) Tuval Foguel, Auburn University-Montgomery |
| April 14 - 16, 2005 | (hosted jointly with Cornelius Pillen) Brian Boe, University of Georgia |
| December 1 - 3, 2004 | Lee Klingler, Florida Atlantic University & University of Nebraska |
| November 18 - 20, 2004 | (hosted jointly with Cornelius Pillen) Chaowen Zhang, Xiamen University, P. R. China & Auburn University |
| November 18 - 20, 2004 | (hosted jointly with Cornelius Pillen) Randall Holmes, Auburn University |
| November 11 - 14, 2004 | (hosted jointly with Cornelius Pillen) Peter Sin, University of Florida |
| July 28 - August 12, 2004 | Bettina Eick, Braunschweig University of Technology, Germany |
| March 7 - 11, 2004 | (hosted jointly with Cornelius Pillen) Daniel Nakano, University of Georgia |
| March 4 - 7, 2004 | (hosted jointly with Cornelius Pillen) Stephen Doty, Loyola University Chicago |
| February 12 - 15, 2004 | Klaus Lux, University of Arizona |
| December 3 - 7, 2003 | Ralf Schmidt, University of Minnesota |
| November 20 - 23, 2003 | Markus Schmidmeier, Florida Atlantic University |