Diana Ionela Popescu (Stegarus) earned her PhD in Industrial Engineering from Lucian Blaga University of Sibiu, Romania, in 2016. She is currently a Scientific Researcher, 2nd Degree (CS II), at the National Research and Development Institute for Cryogenic and Isotopic Technologies (ICSI Râmnicu Vâlcea), where she conducts research in analytical chemistry, food and environmental analysis, and contaminant monitoring. She is also Project Director of the ADER 6.3.7 project (2023–2026), funded by the Romanian Ministry of Agriculture and Rural Development, focusing on the investigation of organochlorine and organophosphorus contaminants along the soil–plant–fruit/vegetable–food product chain. Her scientific work has resulted in numerous publications and scientific communications, including recent studies published in international journals on wine authenticity, pesticide residues, and food safety. Her research interests include chromatographic and mass spectrometric techniques, pesticide residue analysis, food authenticity and traceability, environmental contaminants, chemical characterization of food products, and the assessment of bioactive compounds and their biological relevance.