"Latvian Scholars and the Realities of Latvian Culture," Annual Commemoration, University of Latvia. Society of Free Letts, Philadelphia, 1976.
"Freedom and Control in the American Landscape," 3rd Annual Winterthur Gardens Conference, Winterthur Gardens, Delaware, 1981.
"From Open Space to Landscape," The Longwood Program Seminars 1981, Longwood Gardens, Pennsylvania, 1981.
Award Dinner Address, 1982 Delaware Junior Science and Humanities Symposium, Newark, Delaware.
"R§ga 1990: Witnessing the Struggle for Independence in the Baltics," United Nations Day Dinner, the Delaware Division of the United Nations Association of the United States of America, Wilmington, DE, 1990.
"Commencement Address," Faculty of Earth and Geographical Sciences, University of Latvia, R§ga, Latvia, June 7, 1995.