I am a micropaleontologist and stratigrapher. My main interests are: (1) Precise dating, large-scale correlations, and astronomical climate change, (2) Paleoclimate and Paleoenvironments, (3) Evolution of marine life. As a micropaleontologist, I am a specialist of calcareous nannofossils. As a stratigrapher, I am specialized in cyclostratigraphy and carbon-isotope stratigraphy. My focus intervals are the  Quaternary,  Paleogene, Cretaceous, and Jurassic.

• The Eocene–Oligocene transition in the south-western Neo-Tethys (Tunisia): astronomical calibration and paleoenvironmental changes. Messaoud, J.H., Thibault, N., Yaich, C., Monkenbusch, J., Omar, H., Ben Jemai, H.F., Watkins, D.K., 2020. Paleoceanography and Paleoclimatology. 35.
• Integrated stratigraphy of the middle-upper Eocene Souar Formation (Tunisian dorsal): implications for the middle Eocene climatic optimum (MECO) in the SW Neo-Tethys. Messaoud, H.J., Thibault, N., Bomou, B., Adatte, T., Monkenbusch, J., Spangenberg, J.E., Aljahdali, H.M., Yaich, C., 2021.Palaeogeography, Palaeoclimatology, Palaeoecology.581. 
• Middle Eocene to early Oligocene biostratigraphy in the SW Neo-Tethys (Tunisia): Large-scale correlations using calcareous nannofossil events and paleoceanographic implications. Messaoud, J.H., Thibault, N., Aljahdali, M.H., Yaich, C., 2023. J. African Earth Sci. 198.
• Benthic biota (nummulites) response to a hyperthermal event: Eccentricity-modulated precession control on climate during the middle Eocene warming in the Southern Mediterranean. Messaoud, J.H., Thibault, N., De Vleeschouwer, D., Monkenbusch, J., Ben Jemai, H.F., Yaich, C. 2023. Frontiers in Earth sciences (Accepted).
• Calcareous nannoplankton response to the middle Eocene global warming event and sea-level changes in the SW Mediterranean. Messaoud, J.H., Thibault, N., Aljahdali, H.M., Gu, Y.G. 2023. Marine micropaleontology.

• Ph.D., Geosciences, Copenhagen University, Copenhagen, Denmark, 2021
• Engineer, Petroleum Geosciences, Sfax University, Tunisia, 2015

• 2022-present: Postdoctoral fellow, KAUST, Thuwal, Saudi Arabia
• 2016-2020: Ph.D., Copenhagen University, Denmark

• The CycloAstro Project.
• International nannoplankton association
• Nordic Sedimentary Research Group
• International Association of Sedimentology
• European Association of Geoscientists and Engineers
• Subcommission on Jurassic Stratigraphy

• Carlsberg fellowship
• Matsumae Fellowship

• Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
• Physical Science and Engineering Division (PSE)