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Philipp Christmann

PostDoc @ CISPA

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  • Affiliation: CISPA Helmholtz Center for Information Security
  • Location: Saarbrücken, Germany

About

Philipp Christmann is a postdoctoral researcher at the CISPA Helmholtz Center for Information Security, advised by Mario Fritz. His research focus is on the interaction between large language models (LLMs) and tools, addressing challenges related to factuality, security, and traceability.

Philipp obtained his PhD with highest honors (summa cum laude) from the Max Planck Institute for Informatics and Saarland University, where he was supervised by Gerhard Weikum and Rishiraj Saha Roy. The title of his PhD thesis was: "Question Answering over Heterogeneous Sources".

During his PhD, he did an internship at Amazon AGI in Barcelona, working on retrieval optimization for long-form answer generation (manager: Adrià de Gispert, mentor: Svitlana Vakulenko).

Research Interests

Question Answering

Conversational QA, long-form QA, complex QA.

NLP

LLMs, agentic frameworks, transparency.

Knowledge Graphs

Linking, reasoning, heterogeneous sources.

Publications

Supervision

Professional Activities