2004: Opening Plenary Address at Nanoparticles for the Vapor Phase Synthesis with Chemical and Biochemical Applications, Davos, Graubunden, Switzerland, Aug. 8–13
2003: Frontiers Lecture, Wayne State University, Detroit, MI, April 7
2003: Albany International Distinguished Lecture in Materials Science and Engineering, RPI, Troy, NY, April 17
2000: Wilhelm Jost Memorial Lectureship (Bunsen-Gesellschaft), delivered at the 7 universities where Jost spent his career: Goettingen, Hanover, Marburg, Darmstadt, Halle, Leipzig, Berlin
1997: Opening Plenary Address at the Celebration of the Millenium of Gdansk, University of Gdansk, Poland
1997: Joel L. Franklin Memorial Lecture, Department of Chemistry, Rice University
1995: Lecture Series for NATO-Advanced Study Institute on Large Clusters of Atoms and Molecules, Erice, Italy
1994: Lecture Series Program Frontiers in Chemical Research as Visiting Professor, Texas A&M University
1993: Special Lecture Series on Clusters as Visiting Professor, University of Western Ontario, Canada
1993: 28th McGregory Lecture, Colgate University
1990: Special Lecture Series as Fulbright Guest Professor, Physics Institute, Leopold-Franzens University, Innsbruck, Austria
1987: Distinguished Lecturer, University of Massachusetts
1987: Lecture Series at International School of Materials Science and Technology on "Elemental and Molecular Clusters", Erice, Italy
1985: Frontiers in Chemistry Lecturer, Case Western Reserve University
1984: Special Lecture Series as Guest Professor, Physics Institute, Leopold-Franzens University, Innsbruck, Austria
1981: Distinguished Speaker, University of Utah
1981: Special Lecture Series as Guest Professor, Physics Institute, Leopold-Franzens University, Innsbruck, Austria
1971: Lecturer, Visiting Scientists Program in Geophysics, administered by the American Geophysical Union under NSF sponsorship
