All the time Montéclair must have worked as a music teacher of high regard: Among his pupils were his colleague Couperin's daughters. His approach to teaching was fresh and almost modern. He published books on teaching music (e.g. 1709) and opened a music shop (1721) before he retired from teaching in 1735. He gave up his position in the opera orchestra shortly before his death in 1737.
Montéclair was not all too productive as a composer, but he tried his talent on most of the genres of the time and exerted a certain influence on Rameau. His specialty was using certain instruments to enhance the stage scene, e.g. letting horns play softly behind the stage to simulate a faraway hunt. Among his stage works are Festes de l'été and Jephté, which was considered difficult by contemporaries.
The only recordings I know of are Jephté on Harmonia Mundi HMC 901424.25 and a collection of cantates which contains my favourite, Le Triomphe de l'Amour. A MIDI version of it is in the MIDI archive.