Which individual is credited with discovering many of the later entries added to the Messier Catalog?

Answer

Pierre Méchain

The list expanded significantly over time largely due to the efforts of Pierre Méchain, who found several objects that were subsequently added to the catalog.

Which individual is credited with discovering many of the later entries added to the Messier Catalog?
astronomydeep-sky objectscelestial objectsCatalogcatalogueMessierCharles Messier