Jean-Marie Lehn is a French chemist known for his pioneering work in the field of supramolecular chemistry, which studies the interactions between molecules. He was awarded the Nobel Prize in Chemistry in 1987, sharing the honor with Donald J. Cram and Charles J. Pedersen for their contributions to the development of molecules with highly selective structure-specific interactions. Lehn's research has significantly advanced our understanding of how molecules can assemble into complex structures, leading to applications in materials science, nanotechnology, and medicine. His work emphasizes the importance of molecular recognition and self-assembly, which are fundamental concepts in supramolecular chemistry.