“Italian Gardens: Roman Origins, Renaissance Expressions & American Reflections.”
Pennsylvania Horticultural Society, 2009. Theme lecture for Philadelphia Flower Show.

“20th Century Garden Trends: A Framework for Design.”
Morris Arboretum, 2001. Keynote speaker at “Celebrating the American Garden” symposium.

“The Spring Garden.”
Haverford College, 1996.

“Trees and Shrubs for Sun and Shade: Creating the Canopy and Understory Layers.”
Haverford College, 1995.

“In the Italian Renaissance Tradition: A Recent Classical Garden Design.”
Classical America Society, Phila., PA, 1994.

“Creating the Public Garden”,
Univ. of VA’s Orland E. White Arboretum, VA, 1994. “Design of Small Public Gardens” symposium speaker.

“Designing with Limitations.”
AABGA Mid-Atlantic Conference @ Haverford College, 1994.

“Garden Elements”,
Haverford College, 1994.

“The Plant Palette: Spatial Elements in the Garden.”
Haverford College, 1994.