This workshop is to commemorate the 60th birthday of Manuel de León. Manuel de León is one of the most important researchers on geometric mechanics. It is worth highlighting his contributions on a wide range of topics such as symplectic geometry, Poisson manifolds, nonholonomic mechanics, Cosserat media, geometric integrators, optimal control theory, among many others. Another facet that makes Manuel de León well-known is his intense dedication to the diffusion of mathematics and his role in mathematical organizations at the international and national levels, including the International Mathematical Union (IMU) and the Real Sociedad Matemática Española (RSME). One could keep going by emphasizing his work on the didactics of mathematics, its popularization, edition and direction of scientific journals, and many other facets. The sum of all these contributions makes Manuel de León deserve this tribute.