Taxonomists are biologists who specialize in identifying, naming, and classifying organisms. They use various methods, including morphology, genetics, and behavior, to understand the relationships between different species and group them into a hierarchical system.

Here are some related terms:

* Systematics: The study of the diversification of life on Earth, including its evolutionary history and relationships.

* Phylogeny: The evolutionary history and relationships of a group of organisms.

* Taxonomy: The practice and science of classification.

While taxonomists are the primary experts in classification, other scientists like ecologists, evolutionary biologists, and geneticists also use classification systems in their research.