Dr. Zulkarnain, S.Si., M.Si., is an Associate Professor of Materials Science in the Department of Physics, Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Syiah Kuala (USK), with research interests in materials science, composites, metals and alloys, renewable energy, hydrogen storage, and energy materials. He earned his Bachelor’s degree in Physics from Institut Teknologi Sepuluh Nopember (ITS), his Master’s degree in Physics from Universitas Indonesia (UI), and a Doctorate in Physics through a DAAD sandwich program between the Technical University of Dresden, Germany, and UI. He has held a range of academic leadership roles, including Head of the Physics Department, Head of the Materials Physics and Thermodynamics Laboratories, and Vice Dean of the Faculty of Marine and Fisheries at USK. His recent research focuses on improving energy storage performance of barium zirconium titanate ferroelectrics via rare-earth doping, developing Fe₃O₄–TiO₂ photocatalysts from natural beach sand, and utilizing biomass-derived natural oxides, coffee skin waste, fly ash, and rice-husk–derived SiC as catalysts in Mg- and MgH₂-based solid hydrogen storage systems, supported by national and international funding schemes. He holds patents on the preparation of nanocrystalline MgH₂ and MgH₂–Ni nanoparticle materials for hydrogen storage and has published on MgH₂–activated carbon composites, sorption behavior of MgH₂ under various milling atmospheres, coconut-shell–reinforced epoxy biocomposites, Acehnese traditional salt for thermal energy storage, bionanocomposites from packaging plastic waste, and nanomagnetite extraction from iron sand. Dr. Zulkarnain is a member of the Materials Research Society–Indonesia (MRS-Id), the Indonesian Magnetic Society (IMS), and the Physical Society of Indonesia (PSI), and teaches in both the Bachelor’s and Master’s programs in Physics at USK.