“Spatial inequity and environmental justice” Environmental studies departmental symposium, Dickinson College, Feb 8, 2011.

“Use of GIS data in spatial inequity cases” in UNC Law School 2010 conference "The Unfinished Work": Advancing New Strategies in the Struggle for Civil Rights.

“Landscape and history in the Susquehanna Valley” Keynote luncheon address at Pennsylvania Historical Association (PHA) October 14, 2010, Susquehanna Univ.

“Building fair housing evidence from GIS data”, California Rural Legal Assistance conference, Monterey CA, May 2010.

"Cryptic Governmental Discrimination & Forensic Uses of GIS" Penn State Department of Geography seminar series, January 30, 2009.

"Mapping Inequality: GIS Applications in Housing Advocacy and Litigation" National Housing Law Project: 2008 Housing Justice Network conference, Washington, DC, December 7, 2008.

"GIS evidence in spatial inequality & discrimination cases" Northwest Justice Project, Seattle, April 28, 2008

"Institutionalization of Racial Inequality in Local Political Geographies: Use of GIS Evidence", with Allan Parnell. Boston AAG meeting, 2008

"Mapping the Changing Racial Ecology of a Small American City: Methodological Lessons from Landscape Ecology", with Allan Parnell and Daniel Lichter, Boston AAG meeting, 2008,

"Reconstructing Anatolian landscapes: understanding the effects of geomorphic degradation on archaeological sites" Drawing on rocks / gathering by the water: archaeological fieldwork at rock reliefs, sacred springs and other places Brown University, March 1, 2008,

“The Date of the Earliest Settlement at Gordion: the Evidence from Core-Sampling” The Archaeology of Phrygian Gordion Penn Museum Center for Ancient Studies, 2007

“Why the River Matters: How the Susquehanna Shapes the History and Human Geography of Central Pennsylvania” Earth & Environmental Sciences Seminar Series, Susquehanna University,  2007

"Ethnicity, mining, and the  stability of the anthracite towns" Nineteenth Century Studies Association meetings, Selinsgrove, Penna, March 2007

"Learning from Lewisburg: field trip" Nineteenth Century Studies Association meetings, Selinsgrove, Penna,  March 2007

"Assessing the Effectiveness of Section 5 Pre-clearance of Annexations in North Carolina," at "Protecting Democracy: Using Research to Inform the Voting Rights Reauthorization Debate", Earl Warren Institute, UC Berkeley, with A. M. Parnell, 2006.

“Revealing cryptic discrimination with GIS,” UNC Law School / Center for Civil Rights Invisible fences: municipal under-bounding and minority exclusion conference, November 2004.

"Resource ecology of Vijayanagara, Medieval Hindu city," AAG 2002 annual meeting, Los Angeles.

"Correlating valley and upland events associated with alluviation at Gordion," Society of American Archaeologists 2001 Annual meetings, New Orleans

"Landscape degradation in Anatolia since Roman times", AAG 2001 annual convention, New York

"Upland sediment and alluvial burial at Iron-Age Gordion, central Anatolia.," Alluvial Archaeology II: University of Leeds, December 2000

Leader, 1999 field conference, Northeast Friends of the Pleistocene, Lewisburg, Pennsylvania, May 22-23, 1999