Pietro Bernardelle

I’m a first year Computer Science PhD Student at The University of Queensland working on bias in large language models (LLMs). Under the supervision of Professor Gianluca Demartini and Dr. Kevin Roitero, my current focus revolves around political bias in LLMs, exploring how persona-based prompting can manipulate model outputs and developing bias mitigation strategies to enhance LLMs fairness.

My recent work include:

• Developing a framework for reducing political bias in LLMs using DPO (ongoing).
• Developing a framework for measuring LLMs perspective alignment effectiveness across downstream applications (ongoing).
• Influencing political ideology in LLMs using synthetic personas (The Web Conference 2025).
• Examining how data quality influences LLMs alignment thorugh DPO (SIGIR-AP 2024).

I currently also serve as a tutor for DATA7201 (Data Analysis at Scale).