Peter Carragher

PhD Student
CASOS and IDeaS Center
Carnegie Mellon University

I’m a PhD student at the Center for Computational Analysis of Social and Organizational Systems (CASOS) and Center for Informed Democracy & Social - cybersecurity (IDeaS) at Carnegie Mellon University, advised by Dr. Kathleen M. Carley and Dr. Patrick Park.

My research primarily focuses on developing search-based interventions, assessing source credibility in online news media, and modeling social influence processes in social media. Utilizing an interdisciplinary approach, I integrate techniques from network science and machine learning with theories from social and information sciences. I use these methods to study information diffusion and retrieval systems, with the aim of enhancing the reliability of the online information ecosystem.

In the past I was lucky to be supervised by Dr. Ashok Goel in the Design Intelligence Laboratory (DILab) at Georgia Insitute of Technology, researching the roles of intellgient agents in educational environments. Prior to this, I developed machine learning detection and response systems at Meta, where my work has been deployed in areas of fraud and deception such as impersonation, coordinated inauthentic behavior, and election integrity.

Publications

KOALA: Knowledge Conflict Augmentations for Robustness in Vision Language Models Peter Carragher, Nikitha Rao, Abhinand Jha, R Raghav, Kathleen M. Carley
Under review. 2025.
preprint pdf . code . data

Quantifying Memorization and Retriever Performance in Retrieval-Augmented Vision-Language Models Peter Carragher, Abhinand Jha, R Raghav, Kathleen M. Carley
Under review. 2025.
preprint pdf

Bridging Social Media and Search Engines: Dredge Words and the Detection of Unreliable Domains Evan M. Williams, Peter Carragher, Kathleen M. Carley
Under review. 2024.
preprint pdf

Detection and Discovery of Misinformation Sources using Attributed Webgraphs Peter Carragher, Evan M. Williams, Kathleen M. Carley
ICWSM 2024: The 18th International AAAI Conference on Web and Social Media. 2024.
conference paper pdf . code . data . slides

Misinformation Resilient Search Rankings with Webgraph-based Interventions Peter Carragher, Evan M. Williams, Kathleen M. Carley
ACM Transactions on Intelligent Systems and Technology: Special Issue on Responsible Recommender Systems. 2024.
journal article pdf . code . data . slides

Accountability in Search Engine Manipulation: A Case Study of the Iranian News Ecosystem Peter Carragher, Kathleen M. Carley
SBP-BRiMS 2024: International Conference on Social Computing, Behavioral-Cultural Modeling and Prediction and Behavior Representation in Modeling and Simulation. 2024.
conference paper pdf . code . data . slides

Simulation of Stance Perturbation Peter Carragher, Lynnette Xian Ng, Kathleen M. Carley
SBP-BRiMS 2023: International Conference on Social Computing, Behavioral-Cultural Modeling and Prediction and Behavior Representation in Modeling and Simulation. 2023.
conference paper pdf . code . slides

Simulation of Stance Perturbation Peter Carragher, Lynnette Xian Ng, Kathleen M. Carley
WSC 2022: Proceedings of the 2022 Winter Simulation Conference. 2022.
abstract

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