Prof. El Hassane Chellai is a recognized contributor to Earth and Planetary Sciences, with 48 scientific publications, over 1,079 citations, and an h-index of 8, reflecting consistent research impact. His work focuses on sedimentology, stratigraphy, basin analysis, and the geodynamic evolution of sedimentary systems, particularly across North African regions. He has contributed to leading international journals and collaborative scientific volumes, advancing knowledge in carbonate platforms, paleoenvironmental reconstruction, and lithospheric processes. His research integrates field investigations, geochemical analysis, and sequence stratigraphy to better understand natural resource formation, including hydrocarbons and mineral deposits. Through interdisciplinary approaches, his studies support both academic research and applied geoscience exploration, contributing to global understanding of Earth systems and sustainable resource management.