• (n.) One who prepares beforehand, as subjects for dissection, specimens for preservation in collections, etc.
A preparator is a person who carefullly removes a fossils from its rock matrix. 
Pre·par'a·tor noun [ Latin praeparator .] One who prepares beforehand, as subjects for dissection, specimens for preservation in collections, etc. Agassiz. 
a person who prepares a specimen, as an animal, for scientific examination or exhibition.