News: Our group has three accepted ICML 2026 papers with external collaborators: Rank-Learner: Orthogonal Ranking of Treatment Effects with Henri Arno, Dennis Frauen, Emil Javurek and Stefan Feuerriegel; ePC: Fast and Deep Predictive Coding for Digital Hardware with Cédric Goemaere, Gaspard Oliviers and Rafal Bogacz; and The Entropic Signature of Class Speciation in Diffusion Models with Florian Handke, Dejan Stančević, Felix Koulischer and Luca Ambrogioni.

I am an associate professor at the Internet Technology and Data Science Lab (IDLab), Ghent University - imec, Belgium. Until a few years ago, I was mainly working on natural language processing (NLP), but I’ve always been more interested in the underlying machine learning methods and models than the natural language applications themselves. As soon as I was appointed assistant professor in 2019, I’ve initiated an AI research track that goes beyond NLP, with health as a key application area. I’ve been very fortunate to gather a group of highly talented PhD students working in that direction, and I’m grateful to the Research Foundation Flanders for funding many of them.

Here are my most recent research tracks:

• Non-conventional AI techniques: recent work on Hopfield Networks and Deep Equilibrium Models, and the ePC technique, which makes it possible to simulate deeper predictive coding networks (ICML 2026).
• Neuro-symbolic AI: progress on clinical reasoning and on learning treatment policies from combined tabular and textual clinical data.
• Causal machine learning: the Rank-Learner approach for robust ranking of treatment effects (ICML 2026).
• Diffusion models: in collaboration with Luca Ambrogioni (Radboud University) we explored dynamic guidance strategies for diffusion models, with papers on negative dynamic guidance (ICLR 2025), feedback guidance (NeurIPS 2025), and class speciation (ICML 2026).
• Synthetic medical data: together with Stijn Vansteelandt and the Syndara team at UZ Ghent we investigated the inferential utility of synthetic clinical data (papers at UAI and NeurIPS 2024).

We’ve spent considerable time and effort over the last year on exploring the state of the art and beyond in AI for drug design, especially from the perspective of powerful protein language models and diffusion models. We’ve set up several collaborations in this area, with imec, and a number of Flemish biotech companies. The goal is that our recent work on diffusion models, energy-based models, and neuro-symbolic approaches in the end come together in the application area of protein design.

Over the last decade, I’ve been building up and co-leading the Text-to-Knowledge research cluster with prof. Chris Develder. We worked on natural language processing (NLP) in general, for applications in several domains (the media, health, economics and law). Our current area of focus in NLP is conversational AI, with a strong emphasis on the use and development of neural language models. Some examples of recent work include the state-of-the-art biomedical sentence encoder BioLORD 2023, the transtokenization method for translating monolingual language models, the work on Anchored Preference Optimization and Contrastive Revisions for the alignment of generative language models, the ideas on highly efficient unsupervised dialogue structure induction, and the work on extreme multi-label classification in the HR domain.

Here’s where I come from. In 2005, I received my M.Sc. degree in electrical engineering at Ghent University, after finishing my final year and master thesis at ETH Zurich, Switzerland. In 2009, funded by a grant from the Research Foundation - Flanders (FWO), I obtained my Ph.D. at the Ghent University Department of Information Technology, under the supervision of prof. Daniel De Zutter, in the area of computational electromagnetics. Shortly afterwards, I got involved in research on Information Retrieval, in collaboration with the Database Group at the University of Twente in The Netherlands. As a post-doc, I was heavily involved in getting project funding and managing projects mainly in the media sector. Gradually, my interests moved to Natural Language Processing, and machine learning and AI in general. It was my research stay in 2016 at University College London, in prof. Sebastian Riedel’s Machine Reading lab, that made me decide to continue my career as an academic researcher. In October 2019, I was appointed assistant professor at IDLab, Ghent University, co-affiliated with imec. Although the job description didn’t change a lot (apart from some additional teaching - which I love), it turns out the freedom in research directions gives lots of satisfaction. That, and the great students that I’ve been lucky enough to attract.