Jean Louis Charles Jeener (31 July 1931 – 10 June 2023) was a Belgian physical chemist and physicist, well known for his experimental and theoretical contributions to spin thermodynamics in solids and for his invention of Two-dimensional nuclear magnetic resonance spectroscopy.Jean pursued his academic interests in science at the Université Libre de Bruxelles (ULB),[2] where he completed degrees in chemistry and physics in the early 1950s.His work led to the development of the Jeener-Broekaert sequence, an innovative method to create and observe dipolar order in solids.[9] Later, Jeener introduced a variant of 2DNMR, today known as Nuclear Overhauser Effect Spectroscopy (NOESY), that gives detailed information about the spin-lattice relaxation matrix[clarification needed], and about the spatial relation between atoms in complex molecules.[10] 2DNMR and its multi-dimensional extensions[clarification needed] reveal so much more information about the chemical and physical environment of the spins that they have since been used in almost all fields of NMR.