He was the founder of the historical demography and one-place study fields.
His 1956 book co-written with Michel Fleury, Des registres paroissiaux à l'histoire de la population.
Henry proposed that it was possible to reconstruct the population of France from 1670 to 1829.
He devised more advanced methods and extracted data from records in order to correct bias and indicate which family histories could be used for different kinds of statistical analyses.
This article about a French historian or genealogist is a stub.