"Object-/Subject-Oriented Politics," be presented at the Symposium on Networked Politics, Ryerson University, Toronto, Canada, October 22 & 23, 2010, invited by Greg Elmer

"Maps, Narratives & Conversations," presented at the workshop on Digital Methods and Migrations, Département Economie et Sciences Sociales de Télécom ParisTech (ENST Ecole nationale supérieure des télécommunications) & Programme TIC Migrations, Fondation Maison des Sciences de l'Homme; co-sponsored by the National Science Foundation (award id 0416353), June 23, 2010, invited by Dana Diminescu

"The Software Arts: Computer Science is a Liberal Art," Symposium on Aesthetic Computing and Neuroaesthetics, Arts Research Center, University of California, Berkeley, May 5, 2010, invited by Whitney Davis & Michael Kelly

"What is Politics 2.0?," New Media Roundtable, Center for New Media, University of California, Berkeley, March 11, 2010, invited by Ken Goldberg

"Using Software (Art) to See the World," for the panel "The Culture of Dispersion," presented at the College Art Association, Chicago, IL, February 10-13, 2010.

"Computers as Tool, Object of Study, Idea, and Institution," presented on the panel "Research/Curriculum Disconnect?" for Computational Media: Creating a 21st Century Curriculum for Games and Playable Media, a workshop for the National Science Foundation (NSF) Directorate for Computer & Information Science & Engineering (CISE) Pathways to Revitalized Undergraduate Computing Education (CPATH), supported by an NSF CPATH Grant "Revitalizing Computer Science Education Through the Science of Digital Media" (Jennifer Burg and Conrad Gleber, PIs), November 19-20, 2009, University of California, Santa Cruz, CA, invited by Michael Mateas

"Software Studies, Software Art, Software Design," Leonardo Art Science Evening Rendezvous (LASER), sponsored by: ZKM|Center for Art and Media and the School of the Art Institute of Chicago, November 9, 2009, University of San Francisco, San Francisco, CA, invited by Piero Scaruffi

"Software Studies" for the panel "Science and Technology Studies in Practice: Experimenting, Collaborating and Intervening," presented at the Society for the Social Studies of Science Annual Meeting, Washington, D.C., October 29, 2009

Discussant for the panel "What is Code? What is Coding? Emerging Science and Technology Studies approaches in studying computer code," at the Society for the Social Studies of Science Annual Meeting, Washington, D.C., October 29, 2009

Moderator for the panel "Authorship, Technologies and Frames" (speakers: Joline Blais, E.G. Crichton, David Evan Harris, Jon Ippolito, Marsha Kinder; respondent: Noah Wardrip-Fruin), The Art of Collaboration: A Symposium, University of California, Santa Cruz, CA, October 23, 2009, invited by B. Ruby Rich, Margaret Morse, and Soraya Murray

"Interactive Social Mapping," Nowcasting: Design Theory & the Digital Humanities: A Transdisciplinary Seminar, Design | Media Arts Department, University of California, Los Angeles, October 16, 2009, invited by Peter Lunenfeld

"Technologies of Community, Conversation by Design: How should networked public spaces be designed?," Research Seminar, Département Economie et Sciences Sociales de Télécom ParisTech (ENST Ecole nationale supérieure des télécommunications), Paris, France, July 8, 2009, invited by Françoise Détienne

Panelist, "Technoscience and Social Change" (with Fred Turner, Caroline Bassett, and Kate O'Riordan), sponsored by the Science and Justice Working Group and the Center for Cultural Studies, University of California, Santa Cruz, CA, May 27, 2009, invited by Jenny Reardon

"Conversation Map v.2.0," in Violence, Technology and Public Intervention: Two UCDARnet Panels, Sponsored by UCDARnet and gallery@calit2, April 24, 2009, CALIT2/Atkinson Hall, Black Box Theater, University of California, San Diego, invited by Ricardo Dominguez

"Software Studies, Software Art, Software Design," Leonardo Art Science Evening Rendezvous (LASER), sponsored by: ZKM|Center for Art and Media, April 8, 2009, SETI Institute, Mountain View, CA, invited by Piero Scaruffi http://www.leonardo.info/isast/events.html#laserapr09

with Michael Dale, Abram Stern, and Mark Deckert, "Metavid.org: A social website and open archive of congressional video," poster and demonstration for "Social Semantic Web: Where Web 2.0 Meets Web 3.0," a Spring Symposium for the American Association of Artificial Intelligence, Stanford University, March 23-25, 2009 http://tw.rpi.edu/portal/AAAI-SSS-09:_Social_Semantic_Web:_Where_Web_2.0_Meets_Web_3.0

"Discourse Architecture," Center for Information Technology Research in the Interest of Society (CITRIS) Research Exchange Colloquium, University of California, Berkeley, March 19, 2009, invited by Ming Wu http://www.citris-uc.org/events/RE-spring2009

Participant, The Changing Dynamics of Public Controversies, (with Yochai Benkler, Bruno Latour, Paul Starr), Journalism School, Columbia University, NY, NY, February 7, 2009, invited by Rasmus Nielsen and Todd Gitlin.

"Social Software and Social Justice," UC Santa Cruz Science and Justice Working Group, University of California, Santa Cruz, CA, February 11, 2009, invited by Jenny Reardon

"Artist's Talk," Interactive Media Seminar, School of Cinematic Arts, University of Southern California, Los Angeles, CA, February 4, 2009, invited by Scott Fisher

"Software Studies," Annenberg Research Park Colloquium Series on Multimedia Literacy, University of Southern California, Los Angeles, CA, February 3, 2009, invited by Mimi Ito

Discussant, "Contemporary Networking and Computing" (with Paul Rabinow) at Ars Synthetica: The Anthropology of the Contemporary, University of California, Santa Cruz, CA, January 16, 2009, invited by Colin Koopman http://foucaultacrossthedisciplines.googlepages.com/arssynthetica.html

"La Forme des Idées," L'Ecole Nationale des Beaux-Arts de Lyon et l'Ecole Nationale Supérieure d'Art de Nice (Villa Arson), France, December 16, 2008, invited by Patrice Maniglier

Panelist, "Design Strategies and Conflict Resolution" (with Amy Franceschini and John Bela), Design and Technology Department at the San Francisco Art Institute, November 19, 2008, invited by Paul Klein

"Software Studies," "Aesthetics and Politics Series," Pratt Institute, Brooklyn, NY, November 12, 2008, invited by Jonathan Beller

"Universities, Schools, Colleges, and Laboratories for Art, Media and Technology," Parsons The New School of Design, New York, NY, November 11, 2008 invited by Katie Salen

"Software Studies," Center for Cultural Studies, UC Santa Cruz, October 8, 2008, invited by Carla Freccero

"Software Studies," Digital Methods Initiative Summer Talk Series and Govcom.org Jubilee, University of Amsterdam, Amsterdam, The Netherlands, 11 August 2008, invited by Richard Rogers

with Jo Ann Sison, "What Makes a Search Engine Good for Democracy? Public Opinion Polling and the Evaluation of Software," presented at Tools for Participation: Collaboration, Deliberation, and Decision Support; Directions and Implications of Advanced Computing; Conference on Online Deliberation (DIAC-2008/OD2008) Berkeley, CA, June 26-29, 2008.

"Media Design as Conversation Design," Media Design Colloquium, Art Center of Design, Pasadena, CA, 18 June 2008, invited by Anne Burdick

"Art, Media and Technology," Parsons The New School of Design, New York, NY, 30 May 2008, invited by Lisa Grocott

"From Software Studies to Software Design," Software Studies Workshop, CALIT2, UC San Diego, 21 May 2008, invited by Lev Manovich and Noah Wardrip-Fruin.

with Michael Dale and Abram Stern, "Feeding Congress to the Web: A New Architecture for the Capitol," presented at Politics: Web 2.0: An International Conference, University of London, Royal Holloway, UK, April 17-18, 2008

"Digital Aesthetics and the Collapse of Contemporary Common Sense," presented at the College Art Association, Dallas, TX, February 2008

"Politics 2.0," Social Graph FOO, O'Reilly Media, Sebastopol, CA, 2 February 2008.

"Technologies of Community, Conversation by Design: How should networked public spaces be designed?," ESI Design, New York, NY, 18 December 2007, invited by Sawad Brooks

"Technologies of Community, Conversation by Design: How should networked public spaces be designed?," University Seminar, Columbia Center for New Media Teaching and Learning, Columbia University, New York, NY, 10 December 2007, invited by Frank Moretti

"Technologies of Community, Conversation by Design: How should networked public spaces be designed?," Digital + Media Colloquium, Rhode Island School of Design, Providence, RI, 23 October 2007, invited by Christiane Paul and Bill Seaman.

"Aesthetics of Information Visualization," Visual Communication Lab, IBM Research, Cambridge, MA, 22 October 2007 (http://www.research.ibm.com/visual/index.html), invited by Fernanda Viegas and Martin Wattenberg.

"Technologies of Community, Conversation by Design: How should networked public spaces be designed?", Communications Colloquium, School of Journalism, Columbia University, New York, NY, 9 October 2007, invited by Rasmus Nielsen.

"Aesthetics, Politics and Networks," art exhibition panel presentation, "Alternative Networks," ACM SIGGRAPH 2007, San Diego, CA, August 2007.

"Art and Aesthetics of Information Visualization," Information Aesthetics Workshop of the Visualization Summit, Swiss Federal Institute of Technology, Zürich, Switzerland, July 3, 2007, invited by Andrew Vande Moere.

"From Networked Publics to Object-Oriented Democracies," presented at the New Network Theory Conference, Institute of Network Cultures, University of Amsterdam, Amsterdam, The Netherlands, June 28-30, 2007, invited by Geert Lovink and Richard Rogers

with Rudolf Frieling (Curator of Media Arts, SFMoMA), "Art, Technology and Conversation," presented at the Art & Conversation Discussion Series, co-organized by the University Art Gallery at Sonoma State University and the Community Foundation Sonoma County, funded by the James Irvine Foundation Communities Advancing the Arts Initiative, Sonoma State University, Sonoma, CA, May 22, 2007, invited by Michael Schwager.

"Technologies of Community, Conversation by Design: How should networked public spaces be designed?" presented at the conference on Planning for the Conservation and Future Design of Towns and Cities: A US-Japan Dialogue, co-organized by the U.S. Embassy, Tokyo; the Graduate School of Interdisciplinary Information Studies; and, the Graduate School of Urban Engineering, University of Tokyo, Tokyo, Japan, April 25, 2007, invited by Shunya Yoshimi

"The Spaces of Open Source Software Design," Association of American Geographers, San Francisco, CA, April 2007

"Aesthetics, Art, and Digital Media," Interdisciplinary Speakers Programs, Department of Philosophy, University of North Carolina, Charlotte, January 18, 2007, invited by Michael Kelley

"Aesthetics of Information Visualization," Visualization Center Seminar Series, Department of Computer Science, University of North Carolina, Charlotte, January 18, 2007, invited by William Ribarsky.

"An Aesthetics of Democracy," presented at the Distributed Aesthetics Seminar, Wissenschaftskolleg (Center for Advanced Study), Berlin, Germany, May 11-12, 2006, invited by Geert Lovink and Anna Munster.

"An Art and Pedagogy of Computer Games," present at the UCDARNet (UC Digital Arts Research Network) Information/Exchange, Design | Media Arts Department, UCLA, Los Angeles, March 2006, invited by Victoria Vesna.

"Aesthetics of Information Visualization," College Art Association, Boston, MA, February 2006.

"Artificial Memory," presented at Saving Time: Interdisciplinary Perspective on Memory and Memorialization, University of California, Santa Cruz, November 2005, invited by Tyrus Miller and David Hoy.

with Flore Barcellini, Françoise Détienne, and Jean-Marie Burkhardt, "Thematic coherence and quotation practices in OSS design-oriented online discussions," Proceedings of ACM Group: International Conference on Supporting Group Work, Sanibel Island, Florida, November 2005

with Flore Barcellini, Françoise Détienne, and Jean-Marie Burkhardt, "A study of online discussions in an Open-Source Software Community: Reconstructing thematic coherence and argumentation from quotation practices," Proceedings of the Communities and Technologies Conference, Milan, Italy, June 2005.

"Reading and Media," Roundtable discussant, Research in the Technological, Social, and Cultural Practices of Online Reading, UCSB, Transliteracies UC MRG, Santa Barbara, CA, June 2005, invited by Alan Liu

with John Kelly and Michael Dale, "Searching the Net for Differences of Opinion," in Proceedings of the Second Conference on Online Deliberation: Design, Research, and Practice, Stanford University, May 2005.

"Agonistics: A Language Game," Software demonstration, Social Computing Symposium, organized by the Social Computing Group in Microsoft Research, Redmond, WA, April 26, 2005, invited by Shelly Farnham

"Public Space, Public Discussion and Social Computing," presented at Mapping Global Landscapes: Emerging Spaces and Subjectivities, Department of Sociology, University of Chicago, May 5, 2005, invited by Saskia Sassen

"Public Space, Public Discussion and Social Computing," presented at the Center for New Media, UC Berkeley, February 24, 2005, invited by Whitney Davis

"Public Space, Public Discussion and Social Computing," presented at the School of Communication, Northwestern University, Technology and Social Behavior Speaker Series, February 18, 2005, invited by Eszter Hargittai

"Public Space, Public Discussion and Social Computing," presented at Department of Modern Culture and Media, Brown University and Department of Digital Media, Rhode Island School of Design (RISD), October 19, 2004, invited by Wendy Hui Kyong Chun and Bill Seaman

"Agonistics: A Language Game," presented at the Institute for Distributed Creativity in collaboration with The Thing (http://www.thing.net), New York City, October 14, 2004, invited by Trebor Scholz

"Network Technologies that do Notwork," presented at the symposium "The Power and Pathology of Networks", The Information Technology, War and Peace Project, The Watson Institute for International Studies, Brown University, September 11, 2004, invited by James Der Derian and Wendy Hui Kyong Chun http://www.watsoninstitute.org/infopeace/ppn/audio/panel4_sack16.mp3

"Sophisticated Simulations: Simulation, Sophistry and Stupid Technical Tricks," Workshop on Simulation and Other Re-enactments: Modeling the Unseen, Banff New Media Institute, Banff, Canada, April 29, 2004, invited by Sara Diamond http://www.banffcentre.ca/bnmi/programs/archives/2004/simulation/asx/Day02/13_sack.asx

"Aesthetics of Information Visualization," International 4S Conference: Social Studies of Science and Society, Paris, France, August 2004

"A Critical Technical Practice," Critical Praxis for the Emerging Culture Symposium, School of Art and School of Architecture, Washington University, St. Louis, MO, April 16, 2004, invited by Sung Ho Kim and Cynthia Weese http://www.arch.wustl.edu/criticalpraxis/overview.htm

"Public Space, Public Discussion and Social Computing," Microsoft Research Social Computing Symposium, Redmond, WA, March 30, 2004, organized by the Social Computing Group in Microsoft Research in collaboration with the Social Computing Research Groups at IBM and FX Palo Alto, invited by Shelly Farnham http://murl.microsoft.com/LectureDetails.asp?1069

"Aesthetics of Information Visualization," Research Workshop for Critical Studies of New Media, Stanford Humanities Center, Stanford University, February 26, 2004, invited by Tim Lenoir

"Picturing the Public: Algorithms and Interfaces for the Presentation of Public Opinion," "Media Art Network Lectures: Mapping," ZKM (Center for Art and Media), Karlsruhe, Germany, January 24, 2004, invited by Rudolf Frieling http://netzspannung.org/cat/servlet/CatServlet?cmd=netzkollektor&subCommand=showEntry&entryId=141107