Selected Publications


Di Zhu, Theodoros Lappas, and Julie Zhang
Unsupervised Tip-Mining from Customer Reviews
Forthcoming, Decision Support Systems


Konstantinos Pelechrinis, Christos Zacharias, Marios Kokkodis, Theodoros Lappas
Economic Impact and Policy Implications from Urban Shared Transportation:
The Case of Pittsburgh’s Shared Bike System

PLoS One


Apostolos Filippas, Theodoros Lappas
Strength in Numbers: Using Big Data to Simplify Sentiment Classifi cation
Big Data


Georgios Valkans, Theodoros Lappas, and Dimitrios Gunopulos
Mining Competitors from Large Unstructured Datasets
IEEE Transactions on Knowledge and Data Engineering


Theodoros Lappas, Gaurav Sabnis, and Georgios Valkanas
The Impact of Fake Reviews on Online Visibility: A Vulnerability Assessment of the Hotel Industry.
Information Systems Research
* Runner Up for best ISR paper in 2016.

Video Summary

NBC New York

NBC Bay Area

INFORMS Journal Highlights,  November 2016 (Interview)

Article @Stevens News


Serhan Kotiloglu, Theodoros Lappas , Kostantinos Pelechrinis, Panagiotis P.Repoussis
Personalized multi-period tour recommendations
Tourism Management.


Ke Zhang, Theodoros Lappas , Kostantinos Pelechrinis
Effects of Promotions on Location-Based Social Media: Evidence from Foursquare
International Journal of Electronic Commerce.

Post Gazzette

Pitt News

Wesa FM


Pei Yang, Hongxia Yang, Haoda Fu, Dawei Zhou, Jieping Ye, Theodoros Lappas, and Jingrui He
Jointly Modeling Label and Feature Heterogeneity in Medical Informatics
ACM Transactions on Knowledge Discovery from Data, 2015


Dimitrios Kotzias, Theodoros Lappas, Dimitrios Gunopulos
Home is Where your Friends Are: Utilizing the Social Graph to Locate Twitter Users in a City.
Elsevier’s Information Systems, 2015.



Under Revision

User Activation, Deactivation and Online Community Welfare
with Marios Kokkodis and Sam Ransbotham

A Team Formation Model for Faultline Minimization
with Behzad Golshan, Sanaz Bahargam, and Evimaria Terzi


Under Review

Importance of Interaction between Content Characteristics and Creator Charactertics for Studying Virality in Social Media with Gaurav Sabnis and Yue Han.

Apples and Oranges: Challenging the Spatial Homogeneity of Online Reviews
with Marios Kokkodis and Kostantinos Pelechrinis.




Working Papers

Reputation and Contribution in Online Question-Answering Communities
with Chris Dellarocas and Neda Derakhshani.


The Guided Team-Partitioning Problem: Definition, Complexity, and Algorithm
with Sanaz Bahargam and Evimaria Terzi