  The pioneering work of E.C.G. Stueckelberg is briefly analyzed: the formalism
of the Stueckelberg field, able to describe a massive vector field, is
reviewed, and some applications are presented. In particular, starting from his
very first application, devoted to describe nuclear phenomena known in the
Thirties, later attempts to demonstrate the renormalizability of the model are
considered. Finally, also string theory and LQG are illustrated to be a
suitable scenario for the Stueckelberg field.
