"Diffractometer Geometries", ESRF Workshop on Surface Diffraction, Grenoble, March 1990
"The Pt(110) Phase Transition", Surface Science-90, La Plagne, France, March 1990
"Cristallographie des Surfaces avec Rayons-X", CNRS, Grenoble, March 1990
"X-ray Crystallography of Surfaces", American Crystallographic Association Annual Meeting, New Orleans, April 1990
"Structure and Roughening of the Pt(110) surface", Faraday Discussions of the Royal Society of Chemistry, Manchester, UK, April 1990
"Atomic Structure of Surfaces and Interfaces using Synchrotron x-ray Diffraction", Solid State Seminar, Bochum, Germany, April 1990
"Semiconductor Interface Structures", Physikalische Kolloquium, Universtät Nürnberg, Erlangen, Germany, May 1990
"Semiconductor Interface Structures", Fritz-Haber Institüt, Berlin, June 1990
"Surface X-ray Crystallography", plenary lecture of International Union of Crystallography Congress, Bordeaux, France, July 1990
"Structure Determination using X-ray Diffraction", Topsøe Summer School on Surface Science, Birkerød, Denmark, August 1990
"Surface Diffraction on Semiconductor Surfaces and Interfaces", NEC Laboratory, Tsukuba, Japan, December 1990
"Metal Surfaces at Elevated Temperatures", Tokyo Institute of Technology, Yokohama, Japan, December 1990