Pantologist n. : One versed in pantology; a writer of pantology.

Example:
What is a Pantologist?

Taxonomy
Pathology, pathologists, disease, clinical pathology, Anatomical pathology, physicians, diagnosis, General pathology, Plant pathology, medical specialty, plant diseases, branches, Molecular pathology, the American, infectious diseases, tissues, Veterinary pathology, Forensic pathology.

Defination from the web:
pathologist will use immunohistochemistry and fluorescent in-situ hybridization to detect markers which ... The autopsy is performed by the pathologist at the request of a coroner usually during the investigation of criminal law cases and civil law cases in some jurisdictions. ...