Sarah Rajtmajer is an associate professor in the College of Information Sciences and Technology and research associate in the Rock Ethics Institute at Penn State. Her research integrates machine learning, AI, and hybrid human-AI systems to understand how information encodes values like accuracy, objectivity, and privacy and the trade-offs involved in managing healthy information ecosystems.
Before joining the Penn State faculty, she served as a consultant to the Defense and Intelligence communities on scientific programs for national security, with specific focus on initiatives in big data and computational social science.
Prior to her work in consulting, Dr. Rajtmajer was an Intelligence Community Postdoctoral Research Fellow at the Applied Research Laboratory and a postdoctoral scholar in the Department of Mathematics at Penn State. She has a Ph.D. in mathematics from the University of Zagreb, Croatia, and a B.A. in mathematics from Columbia University.
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Projects
Recent Publications
Open science practices among early-career human-computer interaction researchers in the US
Chakravorti, T., Gautam, S. & Rajtmajer, S., Nov 2025, In: PloS one. 20, 11 November, e0334692.Research output: Contribution to journal › Article › peer-review
Reproducibility and replicability in research: What 452 professors think in Universities across the USA and India
Chakravorti, T., Koneru, S. & Rajtmajer, S., Mar 2025, In: PloS one. 20, 3 March, e0319334.Research output: Contribution to journal › Article › peer-review
The digitally accountable public representation database: online communication by U.S. officials
Tai, Y. C., Nakka, N., Patni, K. N., Rajtmajer, S., Munger, K., Lin, Y. R. & Desmarais, B. A., Dec 2025, In: Scientific Data. 12, 1, 1556.Research output: Contribution to journal › Article › peer-review
The unappreciated role of intent in algorithmic moderation of abusive content on social media
Wang, X., Koneru, S., Venkit, P. N., Frischmann, B. & Rajtmajer, S., 2025, In: Harvard Kennedy School Misinformation Review. 6, 3Research output: Contribution to journal › Article › peer-review
From Philosophy to NLU: Evolving Definitions of Research Hypotheses
Wu, J. & Rajtmajer, S., 2025, In: CEUR Workshop Proceedings. 4065, p. 87-96 10 p.Research output: Contribution to journal › Conference article › peer-review
Effect of AI Performance, Risk Perception, and Trust on Human Dependence in Deepfake Detection AI System
Zhou, Y., Chen, E., Pisipati, M., Xiong, A. & Rajtmajer, S., Oct 16 2025, In: Proceedings of the ACM on Human-Computer Interaction. 9, 7, CSCW407.Research output: Contribution to journal › Article › peer-review
Exploring Trust and Risk during Online Bartering Interactions
Lakkanige, K., Cooley-Russ, L., Wagner, A. R. & Rajtmajer, S., 2024, In: CEUR Workshop Proceedings. 3634, p. 19-26 8 p.Research output: Contribution to journal › Conference article › peer-review
Artificial Prediction Markets Present a Novel Opportunity for Human-AI Collaboration
Chakravorti, T., Singh, V., Rajtmajer, S., McLaughlin, M., Fraleigh, R., Griffin, C., Kwasnica, A., Pennock, D. & Lee Giles, C., 2023, In: Proceedings of the International Joint Conference on Autonomous Agents and Multiagent Systems, AAMAS. 2023-May, p. 2304-2306 3 p.Research output: Contribution to journal › Conference article › peer-review
Content Sharing Design for Social Welfare in Networked Disclosure Game
Jia, F., Qiu, C., Rajtmajer, S. & Squicciarini, A., 2023, In: Proceedings of Machine Learning Research. 216, p. 973-983 11 p.Research output: Contribution to journal › Conference article › peer-review
The evolution of scientific literature as metastable knowledge states
Koneru, S. D., McCauley, D. R., Smith, M. C., Guarrera, D., Robinson, J. & Rajtmajer, S., Jul 2023, In: PloS one. 18, 7 July, e0287226.Research output: Contribution to journal › Article › peer-review
ACTIVE CLASS SELECTION FOR FEW-SHOT CLASS-INCREMENTAL LEARNING
McClurg, C., Ayub, A., Tyagi, H., Rajtmajer, S. M. & Wagner, A. R., 2023, In: Proceedings of Machine Learning Research. 232, p. 811-827 17 p.Research output: Contribution to journal › Conference article › peer-review
Establishing ground truth in the traumatic brain injury literature: if replication is the answer, then what are the questions?
Priestley, D. R., Staph, J., Koneru, S. D., Rajtmajer, S. M., Cwiek, A., Vervoordt, S. & Hillary, F. G., 2023, In: Brain Communications. 5, 1, fcac322.Research output: Contribution to journal › Review article › peer-review
Differential Privacy Enabled Dementia Classification: An Exploration of the Privacy-Accuracy Trade-off in Speech Signal Data
Suhas, B. N., Rajtmajer, S. & Abdullah, S., 2023, In: Proceedings of the Annual Conference of the International Speech Communication Association, INTERSPEECH. 2023-August, p. 346-350 5 p.Research output: Contribution to journal › Conference article › peer-review
Evidence of inter-state coordination amongst state-backed information operations
Wang, X., Li, J., Srivatsavaya, E. & Rajtmajer, S., Dec 2023, In: Scientific reports. 13, 1, 7716.Research output: Contribution to journal › Article › peer-review
Feeding the machine: Challenges to reproducible predictive modeling in resting-state connectomics
Cwiek, A., Rajtmajer, S. M., Wyble, B., Honavar, V., Grossner, E. & Hillary, F. G., Feb 1 2022, In: Network Neuroscience. 6, 1, p. 29-48 20 p.Research output: Contribution to journal › Article › peer-review