Professor Haddad has a distinguished career in the area of development and application of methods for the separation of inorganic species. His work includes high performance liquid chromatography (HPLC), its applications to foods, pharmaceuticals and trace metal analysis; ion chromatography (IC), including theory and applications to the minerals industry, environmental analysis, and instrument manufacture; capillary electrophoresis and capillary electrochromatography of inorganic species and low molecular weight acids and bases; spectrofluorometry, as applied to trace metal analysis using ternary complexes; the development of electrochemical detectors for liquid chromatography. He has published more than 210 papers in international journals, made numerous plenary and keynote lecture presentations and is on the editorial board of 10 major journals in analytical chemistry.