Dr. Mohammad N. Siddiqui is a Professor of Chemistry at King Fahd University of Petroleum & Minerals (KFUPM), Saudi Arabia. His area of research interest is represented in Recycling of Waste Plastics with Petroleum Residue and Catalysts, Polymer Degradations and Modifications, Polymer Nano-composite Materials, Crude oils, Asphalts and Fractions with Emphasis on the Chemistry of Asphaltenes, Thermal and Catalytic Cracking and NMR, FT-IR, and HP-GPC Techniques for the Characterization of Petrochemicals.