Defining molecular electrochemistry as a “segment of electrochemistry where attention is primarily focused on the molecular changes brought about by electron transfer to or from an electrode”, it is evident that this analytical tool is an exceptional way to investigate molecular reactivity and establish concepts in chemistry and biochemistry. Prof. J.-M. Savéant, who sadly passed away in August 2020, dedicated his long career to developing, conceptualizing and using molecular electrochemistry with cyclic voltammetry as a guideline. From electron transfer reactions to molecular and enzymatic catalysis of electrochemical reactions, his contributions were indubitably key to the development of the field of molecular electrochemistry as well as found applications in photochemistry, material science, biochemistry, radical chemistry and synthetic chemistry. Herein we will try to review some of his essential pieces of work, spanning from molecular catalysis to his unique contributions to dissociative electron transfers and proton-coupled electron transfers. [1] Savéant, J.-M.; Costentin, C., Elements of molecular and biomolecular electrochemistry: an electrochemical approach to electron transfer chemistry. 2nd ed.; John Wiley & Sons, 2019. [2] Costentin, C.; Limoges, B.; Robert, M.; Tard, C., A pioneering career in electrochemistry: Jean-Michel Savéant. ACS Catal. 2021, 11 (6), 3224-3238. [3] Amatore, C.; Savéant, J.-M., ECE and disproportionation. VI. General resolution. Application to potential step chronoamperometry. J. Electroanal. Chem. Interfacial Electrochem. 1979, 102 (1), 21-40.