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Expert has over thirty years of experience in both basic and applied research. His graduate work was concerned with the development of biochemical sensors based on chemically modified thermistors and electrodes using enthalpimetric and electroanalytical techniques. He also worked on the chemical characterization of electrode surfaces using various spectroscopic (FTIR, mass spectrometry, ESCA) and thermal analysis (TGA, DTA, DSC) procedures. Early in his industrial career, Expert was responsible for method development and problem solving using gas chromatography, high performance liquid chromatography, and thin layer chromatography on pharmaceutical raw material and dosage forms. Later, he concentrated his research efforts in the areas of electroanalytical analysis of organic impurities, ion chromatography, microscopy (optical, SEM), and general wet chemical testing. He has developed methods for the determination of organic impurities in water-soluble polymers using square wave voltammetry, inorganic and organic acid content of polar organic solvents using ion chromatography and capillary electrophoresis, and analysis of preservatives in cosmetic formulations using liquid chromatography with electrochemical detection. He has published approximately thirty-three research papers and holds ten patents. Expert has directed the research activities of a product and formulation research development department in the areas of pharmaceutical, agricultural and beverage science and is knowledgeable in emulsion, microemulsion, tabletting, and beverage treatment technologies. He also has experience in the development of formulations in support of products used in the fields of cytology, histology and hematology. Expert has been a member and former President (2004) of the governing board of the Eastern Analytical Symposium since 1994, a corporate representative to the Industrial Research Institute, and Treasurer of the International Precious Metals Institute. He also is a member of the advisory board (curriculum) of the College of Arts and Sciences of St. John’s University.

He has provided technical guidance to a precious metals secondary refiner for the reclamation of gold, silver, platinum, and palladium from jewelry scrap, resulting in significantly enhanced recovery of these metals in the refiner's process.He has provided technical information and process design to another consultant (subcontractor basis) for the use of in-line Raman spectroscopy for the determination of inorganix anions in brine streams.