- School of Business, Yonsei University, October 2012.

- Haskayne School of Business, University of Calgary, February 2011.

- College of Business, City University of Hong Kong, February 2011.

- Carlson School of Management, University of Minnesota, February 2010.

- Robert H. Smith School of Business, University of Maryland, February 2010.

- School of Management, University of Texas at Dallas, January 2010.

"Estimating Demand for Applications in the New Mobile Economy," with Anindya Ghose, INFORMS Annual Meeting IS Cluster, Phoenix, USA, October, 2012.

"Analyzing the Interdependence between Web and Mobile Advertisement," with Anindya Ghose and Sunghyuk Park, INFORMS Annual Meeting IS Cluster, Phoenix, USA, October, 2012.

"Empirical Analysis of the Impact of Product Diversity on Long-Term Performance of Recommender Systems," with Sunghyuk Park, Annual International Conference on Electronic Commerce (ICEC 2012), Singapore, August, 2012.

"Mobile Advertising and App Adoption in the New Mobile Economy," with Anindya Ghose, Statistical Challenges in Electronic Commerce Research (SCECR 2012), Montreal, Canada, June, 2012.

"Consumer Surplus in the New Mobile Economy: Estimating Demand for Mobile Apps," with Anindya Ghose, INFORMS Marketing Science Conference, Boston, USA, June, 2012.

"Tie Strength and Network Closure on the Mobile Internet," with Anindya Ghose, Raghuram Iyengar, INFORMS Marketing Science Conference, Boston, USA, June, 2012.

"Consumer Surplus in the New Mobile Economy: Estimating Demand for Mobile Applications," with Anindya Ghose, Application of the Web Workshop (AppWeb 2012), Lyon, France, April, 2012.

"Consumer Surplus in the New Mobile Economy: Estimating Demand for Mobile Apps," with Anindya Ghose and Sung-Hyuk Park, Annual International Industrial Organization Conference (IIOC 2012), Washington DC, USA, March, 2012.

"Analzying the Impact of Network Stability on Social Contagion: An Empirical Analyses of Mobile Internet User Behavior," with Anindya Ghose and Raghuram Iyengar, Workshop on Information Systems and Economics (WISE 2011), Shanghai, China, December, 2011.

"How is the Mobile Internet Different? Search Costs and Local Activities," with Anindya Ghose and Avi Goldfarb, Summer Institute in Competitive Strategy (SICS 2011), Berkeley, CA, July, 2011.

"An Empirical Analysis of the Relationship between Display and Sponsored Search Advertising," with Anindya Ghose and Avi Goldfarb, Wharton Customer Analytics Initiative-Organic Research Conference, Philadelphia, PA, July, 2011.

"How is the Mobile Internet Different? Search Costs and Local Activities," with Anindya Ghose and Avi Goldfarb, Second Annual Conference on Internet Search and Innovation, Chicago, IL, June, 2011.

"How is the Mobile Internet Different? Search Costs and Local Activities," with Anindya Ghose and Avi Goldfarb, INFORMS Marketing Science Conference, Houston, TX, June, 2011.

"How is the Mobile Internet Different? Search Costs and Local Activities," with Anindya Ghose and Avi Goldfarb, Statistical Challenges in Electronic Commerce Research (SCECR 2011), Houston, TX, June, 2011.

"How is the Mobile Internet Different? Search Costs and Local Activities," with Anindya Ghose and Avi Goldfarb, Workshop on Information Systems and Economics (WISE 2010), Rio de Janeiro, Brazil, June, 2011.

"Search Costs and Benefits on the Mobile Internet: An Empirical Analysis of Microblogging Behavior," with Avi Goldfarb and Anindya Ghose, Workshop on Information Systems and Economics (WISE 2010), St. Louis, MO, December, 2010.

"Modeling Consumer Behavior in Social Media: Analyzing the Role of Geographical Location and Multi-channel Usage in Microblogging Platforms," with Avi Goldfarb and Anindya Ghose, Marketing Science Institute and Wharton Interactive Media Initiative Conference on the Modeling Cross-Platform and Multi-channel Customer Behavior (MSI-WIMI 2010), Philadelphia, Pennsylvania, December, 2010.

"Search Costs and Benefits on the Mobile Internet: A Comparison of Micro-blogging Responses on Mobile Devices and PCs," with Avi Goldfarb and Anindya Ghose, Conference on Information Systems and Technology (CIST 2010), Austin, Texas, November, 2010.

"An Empirical Analysis of User Behavior in Micro-Blogging Platforms: The Impact of Social and Spatial Networks on Brand Value," with Anindya Ghose, Statistical Challenges in Electronic Commerce Research (SCECR 2010), Austin, Texas, June, 2010.

"User Content Generation and Usage Behavior in Mobile Multi-media Settings: A Dynamic Structural Model of Learning," with Anindya Ghose, International Industrial Organization Conference (IIOC 2010), Vancouver, Canada, May, 2010.

"A Structural Model of User Learning and Dynamics in Mobile Phone Content Services," with Anindya Ghose, NET Institute, New York, April, 2010.

"Dynamic Structural Model of User Learning in Mobile Media Content," with Anindya Ghose, Workshop on Information Systems and Economics (WISE 2009), Phoenix, Arizona, December, 2009.

"User content generation and usage in digital media: Interdependencies, social networks, and mobile advertising," with Anindya Ghose, Marketing Science Institute and Wharton Interactive Media Initiative Conference on the Emergence and Impact of User-Generated Content (MSI-WIMI 2009), Philadelphia, Pennsylvania, December, 2009.

"An Empirical Analysis of User Content Generation and Usage Behavior in Mobile Media," Workshop on the Potential of Social Software for Knowledge Creation and Economic Performance (ZEW-KMRC 2009), Mannheim, Germany, Nov, 2009.

"A Structural Model of Learning and Dynamics in Mobile Media Content: User Learning from Own Usage and Via Social Networks," with Anindya Ghose, in poster session of Workshop on Information in Networks (WIN 2009), New York, USA, September, 2009.

"A Structural Model of User Learning in Mobile Digital Media: The Value of Direct Experience vs. Word-of-Mouth Effect," with Anindya Ghose, Marketing Dynamics Conference, New York, USA, August, 2009.

"Preprocessing Uncertain User Profile Data: Inferring a User's Actual Age from Ages of the User's Local Network Neighbors," with Sung-Hyuk Park, in Proceedings of Advanced Information Networking and Applications (AINA 2009), Bradford, UK, May, 2009.

"User-Generated Content in Mobile Digital Media: Modeling Interdependencies, Social Effects and Geographical Mobility," with Anindya Ghose, Statistical Challenges in Electronic Commerce Research (SCECR 2009), Pittsburgh, Pennsylvania, May, 2009.

"Personalizing Customer Service via Email," with Wenling Hsu and Ann Skudlark, Frontiers in Service Conference, Washington D.C., October, 2008.

"Personalizing Customer Service in the Email Channel," with Jae-Hyeon Ahn, INFORMS Marketing Science Conference, Vancouver, Canada, June, 2008.

"A Self-Selection Bias in Evaluating Impact of Acquisition Channels on Customer Retention," with Jae-Hyeon Ahn and Dong-Joo Lee, Frontiers in Service Conference, San Francisco, California, October, 2007.

"Impact of Customer Acquisition Channel on High Tech Services using VoIP as an Example," with Jae-Hyeon Ahn, Dong-Joo Lee, and Ann Skudlark, International Telecommunications Society (ITS) European Regional Conference, Istanbul, Turkey, October, 2007.

"A Self-Selection Problem in Appraising the Effect of a Firm's Customer Contact Channels on Customer Retention", with Jae-Hyeon Ahn and Dong-Joo Lee, Korea Marketing Association Spring Conference, Seoul, Korea, March, 2007.

"Determinants of Early Customer Churn for Subscription-Based High-Tech Service in its Early Stage of Product Life-Cycle: With An Application of Voice over Internet Protocol (VoIP) Service," with Jae-Hyeon Ahn and Dong-Joo Lee, Korean Operations Research and Management Science Society Conference, Seoul, Korea, October, 2006.

"Consumer Post-Purchase Behaviors for VoIP Services," with Jae-Hyeon Ahn, Dong-Joo Lee, Ann Skudlark, and Arun Bhattacharyya, International Telecommunications Society (ITS) Biennial Conference, Beijing, China, August, 2006.

"Consumer Preference Analysis for Next-Generation Mobile Services Using the Multi-Attribute Evaluation Methods," with Jae-Hyeon Ahn, Young-Suk Bang, Moon-Koo Kim, and Jong-Hyun Park, Korea Society of Management Information Systems Conference, Seoul, Korea, May, 2006.

"Customer Churn Determinants and Mediation Effects of Partial Defection in the Korean Mobile Telecommunications Service Industry," Global Technology Management Consortium (GTMC) Doctoral Dissertation Conference, Robert H. Smith School of Business, University of Maryland, College Park, Maryland, October, 2005.

"Consumer Preference for New Wireless Data Services," with Jae-Hyeon Ahn, Kyung-Young Jee, and Moon-Koo Kim, International Telecommunications Society (ITS) Africa-Asia-Australasia Regional Conference, Curtin University of Technology, Perth, Western Australia, August, 2005.

"Substitutability and Complementarity Analysis using Stage Transition Diagram in the New Telecommunications Services: An Application to WiBro Service," with Jae-Hyeon Ahn, Moon-Koo Kim, Bongwon Park, Sangyoon Lee, Young-Suk Bang, Korean Operations Research and Management Science Society Conference, Seoul, Korea, August, 2004.

"Empirical Analysis of Customer Churning Behavior in the Mobile Telecommunications Industry," with Jae-Hyeon Ahn and Myung-Soo Kim, Decision Science Institute (DSI) International Conference, Shanghai, China, August, 2003.

"Convergence Phenomenon and Service-Network Matrix," with Jae-Hyeon Ahn and Ann Skudlark, International Telecommunications Society (ITS) Biennial Conference, Seoul, Korea, August, 2002.