| 2013 | Seminar Speaker | International Center for Quantum Physics, Peking University, Beijing, China, June 10, 2013. | |
| 2013 | Invited Speaker | 14th International Workshop on “Vortex Physics”, Nanjing, China, May 21-28, 2013. | |
| 2013 | Invited Speaker | APS March Meeting, Baltimore, MD, March 20-24, 2013. | |
| 2012 | Invited Speaker | International Workshop on “Phase Separation and Superstripes”, Erice, Italy, July 11-17, 2012. | |
| 2012 | Invited Speaker | PLASMA2012, Cesme, Turkey, June 10-13, 2012. | |
| 2011 | Invited Speaker | Second JST-DFG Workshop on “Terahertz superconductors Electronics”, Blaubeuren, Germany, October 16-19, 2011. | |
| 2010 | Invited Speaker | First JST-DFG Workshop on “Terahertz Superconductor Electronics”, Tsukuba, Japan, February 21-24, 2010. | |
| 2010 | Invited Speaker | PLASMA2010, Hirosaki, Japan, April 30-May 2, 2010. | |
| 2010 | Invited Speaker | International Workshop on “Quantum Coherent Properties of Spins III”, UCF, December 20-22, 2010. | |
| 2009 | Invited Speaker | Coma-ruga V International Workshop on “Nanomagnetism and Superconductivity”, Coma-ruga, Spain, July 7-10, 2009. | |
| 2009 | Invited Speaker | Symposium on “Spin Physics and Nanomagnetism”, Lehman College, CUNY, March 13-14. | |
| 2009 | Co-Chair, Plenary Invited Speaker, and Proceedings Editor | 7th International Conference on “New Theories, Discoveries, and Applications of Superconductors and Related Materials,” Beijing, China, May 13-16. | |
| 2008 | Invited Speaker | Plasma2008, Pohang, Korea, July 17-19. | |
| 2008 | Invited Speaker | MiniWorkshop on “Terahertz Radiation from Superconductors”, Tokyo, Japan, November 20-21. | |
| 2008 | Invited Speaker | 3rd Annual Autumn Lectures on “Nanoscience and Engineering for Young Scientists”, Tokyo, Japan, November 22-28. | |
| 2008 | Invited Speaker | Condensed Matter Theories, Loughborough, UK August 11-18. | |
| 2007 | Invited Speaker | Coma-ruga III International Workshop on “Nanomagnetism”, Coma-ruga, Spain, July 1-4 | |
| 2007 | Invited Speaker | International Workshop on “The Road to Room Temperature Superconductivity”, Loen, Norway, June 17-23 | |
| 2007 | Co-Chair, Plenary Invited Speaker, and Proceedings Editor | 6th Interantional Conference on “New Theories, Discoveries, and Applications of Superconductors and Related Materials”, Sydney, Australia, Jan. 6-11 | |
| 2006 | Invited Speaker | APS March Meeting, Baltimore, MD | |
| 2004 | Invited Speaker | 4th International Conference on “Nanoscale Heterogeneity and Quantum Phenomena in Complex Oxides (Stripes 2004)”, Rome, Italy, Sept. 26-Oct. 2 | |
| 2004 | Plenary Invited Speaker | 5th International Conference on “New Theories, Discoveries, and Applications of Superconductors and Related Materials”, Chongqing, China, June 10-15 | |
| 2004 | Invited Speaker | 2004 University of Miami Conference on “High Temperature Superconductvity”, Miami, FL Jan. 11-16 | |
| 2003 | Invited Speaker | International Workshop on “Quantum Transport in Synthetic Metals & Quantum Functional Semiconductors, 2003”, Seoul, Korea, Nov. 19-22 | |
| 2003 | Invited Speaker | International Conference on “Dynamic Inhomogeneities in Complex Oxides”, Bled, Slovenia, June 14-20 | |
| 2003 | Invited Speaker | STS 2003 Conference on “Nonequilibrium Physics at Short Times Scales”, Dresden, Germany, May 5-16 | |
| 2002 | Invited Speaker | 23rd International Conference on Low Temperature Physics (LT23), Hiroshima, Japan, Aug. 20-27 | |
| 2002 | Invited Speaker | STS 2002 Conference on “Formation of Correlations”, Bad Honnef, Germany, June 24-28 | |
| 2002 | Invited Speaker | SCRM 2002 Meeting on “Superconductivity, CMR and Related Materials”, Giens, France June 1-8 | |
| 2002 | Invited Speaker | University of Tennessee-Knoxville Workshop on Chemical Physics, Knoxville, TN Feb. 7-8 | |
| 2001 | Invited Speaker | NATO Advanced Research Workshop on “New Trends in Superconductivity”, Yalta, Ukraine, Sept. 16-20 | |
| 2001 | Invited Speaker | APS March Meeting, Seattle, WA | |
| 2001 | Co-Chairman | Third International Conference on “New Theories, Discoveries, and Applications of Superconductors and Related Materials”, Jan. 16-19, Honolulu, HW | |
| 2000 | Invited Speaker | 48th Midwest Solid State Physics Symposium, University of North Dakota, Grand Forks, ND, Oct. 14-15 | |
| 2000 | Invited Lecturer | 25th International Nathiagali Summer College, Nathiagali, Pakistan, June 26-July 15 | |
| 2000 | Opponent | Ph. D. Thesis Defense of Dr. Johan Axnäx, Kungliga Tekniska Högskolan, Stockholm, Sweden, March 10 | |
| 2000 | Invited Speaker | Gordon Conference on “Superconductivity”, Harbortown Resort, Ventura, CA | |
| 1999 | Invited Speaker | Second International Conference on “New Theories, Discoveries, and Applications of Superconductors and Related Materials”, Las Vegas, NV | |
| 1998 | Invited Speaker | SPIE Conference 3480 on “Superconducting Superlattices II: Native and Artificial”, San Diego, CA | |
| 1998 | Plenary Invited Speaker | NATO Advanced Research Workshop on “Symmetry and Pairing in Superconductivity”, Yalta, Crimea, Ukraine | |
| 1998 | Plenary Invited Speaker | First International Conference on “New Theories, Discoveries, and Applications of Superconductors and Related Materials”, Baton Rouge, LA | |
| 1997 | Chairman | 25th Midwest Solid state Theory Symposium, Argonne National Laboratory, Argonne, IL | |
| 1997 | Invited Lecturer | Institut für Theoretische Festkörperphysik, Universität Hamburg, Hamburg, Germany, July 4-11. | |
| 1997 | Invited Lecturer | Department of Industrial Chemistry, Tokyo Unaiversity, Tokyo, Japan, April 7-18. | |
| 1996 | Plenary Invited Speaker | International Workshop on “High Temperature Superconductivity-Ten Years After Its Discovery”, Jaipur, India | |
| 1996 | Plenary Invited Speaker | Adriatico Research Conference on “Fluctuation Phenomena in High Temperature Superconductors”, ICTP Trieste, Italy | |
| 1996 | Invited Speaker | SPIE Conference on “Oxide Superconductors: Physics and Nanoengineering II”, San Jose, CA | |
| 1995 | Invited Speaker | 23rd Midwest Solid State Theory Conference, Kansas State University, Manhattan, KS | |
| 1995 | Invited Speaker | 1995 Taiwan International Conference on “Superconductivity”, Hualien, Taiwan, ROC | |
| 1995 | Chairman | Workshop on “Magnetism in Multilayered and Reduced Dimensional Systems”, Argonne National Laboratory, Argonne, IL | |
| 1995 | Invited Speaker | APS March Meeting, San Jose, CA | |
| 1994 | Invited Speaker | SPIE Technical Conference on “Superconducting Superlattices and Multilayers”, Los Angeles, CA | |
| 1993 | Chairman | Workshop on “Electronic Properties of Disordered Systems”, Argonne National Laboratory, Argonne, IL | |
| 1993 | Invited Speaker | AMS-SIAM-IMS Summer Research Conference on “Mathematics of Superconductivity”, University of Washington, Seattle, WA | |
| 1992 | Invited Speaker | Sixth Annual Conference on “Superconductivity”, Buffalo, NY | |
| 1992 | Invited Speaker | APS March Meeting, Indianapolis, IN | |
| 1991 | Invited Speaker | Univ. Miami Workshop on “Electronic Structure and Mechanisms for High Temperature Superconductivity”, Miami, FL | |
| 1989 | Invited Speaker | Gordon Conference on “Phenomenology of High Temperature Superconductors”, Wolfeboro, NH | |
| 1989 | Invited Speaker | APS March Meeting, St. Louis, MO | |
| 1988 | Invited Speaker | Conference on “Phenomenology of High Temperature Superconductivity”, Los Alamos, NM | |
| 1987 | Invited Speaker | 3rd International Workshop on “Condensed Matter Theories”, Oulu, Finland | |
| 1986 | Invited Speaker | XV Yamada Conference on “Charge-density Waves”, Lake Kawaguchi, Japan | |
| 1986 | Invited Speaker | 17th Rare Earth Conference, Hamilton, ON, Canada | |
| 1986 | Invited Speaker | APS March Meeting, Las Vegas, NV | |
| 1985 | Invited Speaker | International Conference on “Charge Density Waves in Solids”, Budapest, Hungary | |
| 1984 | Invited Speaker | Gordon Conference on “Quantum Solids and Fluids”, Wolfeboro, NH | |
| 1979 | Chairman | 27th Midwest Solid State Physics Conference, Ames, IA | |
| 1977 | Participant | Joint US-USSR Symposium on Condensed Matter Physics, Aspen, CO | |
| 1976 | Invited Speaker | 4th Midwest Solid State Theory Symposium, University of Chicago, Chicago, IL |