He studied piano under Pierre Sancan, as well as Harmony (Alain Bernaud), Counterpoint (Jean-Paul Holstein), Fugue (Michel Merlet), and Orchestration (Serge Nigg) at the Conservatoire de Paris, from 1979 to 1984, in addition to studying the Organ with Jean Galard through the Ville de Paris.
Delplace began to compose in the mid-1980s, with a firm conviction, though unpopular at the time, that tonal music still hides infinite unexplored territories.
In 2000, he joined the Phoenix Group founded by Jean-François Zygel and Thierry Escaich, in order to propose an alternative to institutionalized contemporary music.
Having explored many different types of ensembles, from orchestra to choir, from chamber music to the organ, he dedicates a large part of his opus to the piano, often played by many prestigious performers.
In 2008, Stéphan Aubé directed a video clip of the Bach Panther fugue and an interview with Stéphane Delplace.