Dr. Gregorios Katsios

Senior NLP Research Scientist, Leidos

I'm a Senior NLP Research Scientist at Leidos, where I design machine learning systems for language understanding and generation, and build them into products that ship.

My recent work spans medical entity extraction, LLM agents, AI-generated text detection, and multimodal AI for government-sponsored research programs. I designed and built an open-domain medical entity extraction system, now a standalone platform with two patents pending, licensed by the U.S. Defense Health Agency for its My Service Treatment Record (mySTR) program. AWS published a technical description of the agentic document-processing architecture behind it.

Before Leidos, I completed my Ph.D. in Computer Science at Rensselaer Polytechnic Institute under Dr. Tomek Strzalkowski, with earlier degrees from SUNY Albany and the University of Peloponnese. My dissertation covered folktale plot representation, story generation, and the evaluation of generated text.

I publish at ACL, LREC-COLING, and IEEE ICDM, and review for ACL Rolling Review.

Research

Medical & Clinical Information Extraction
Open-domain entity extraction from unstructured clinical documents, deployed in federal health systems

LLM Agents & Agentic Systems
Multi-agent architectures for document understanding and fault detection

AI-Generated Text Detection
Transformer approaches to distinguishing machine-generated text

Authorship Attribution & Privacy
Figurative-language signals for attribution, and rewriting for author privacy

Agenda Detection & Political Communication
Bilingual agenda detection on social media, including the 2022 French presidential elections

Text Generation & Evaluation
Plot representation, story generation, and evaluating generated text

Beyond the Lab

When I'm not at a terminal, I'm usually on the water. I'm an avid kayaker and have spent years exploring the rivers and lakes of the East Coast, drawn especially to river routes where the tree canopy closes overhead and the landscape shifts around every bend. I also snowboard whenever the season allows.

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