Oncologists are the ones who study cancer and how to treat it.
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a person that studies gems is called a gemologist.
A person who studies genealogies is a genealogist.
a person who studies people but not an psychologist
what do you call somebody who studies snails.
A person that studies animals is called a Zoologist.
A person who studies birds is called an ornithologist.
A person who studies birds is called an Ornitholoigst
A sociologist is a person who studies sociology.
The study is paleontology so I think a person who studies it is a paleontologist.
A person who studies the aging process is called a gerontologist.
A person who studies medicine is called a medical student.