Dr. Jean-François (Jef) Focant is a Full Professor of Analytical Chemistry at the University of Liège in Belgium, where he leads the Organic and Biological Analytical Chemistry (OBiAChem) Laboratory. An expert in GC×GC–MS, Dr. Focant focuses on the development and validation of analytical methods for detecting volatile and semi-volatile compounds in complex matrices. His team addresses real-world analytical challenges across diverse fields, including forensics, food safety, archaeology, and clinical diagnostics. Recent research in his lab has emphasized metabolomics and volatolomics, particularly for biomarker discovery in medical applications. The OBiAChem lab also develops chemometric strategies for feature selection in large, multi-class datasets.