An apiologist.
a beekeeper
a geneticist
Biologists.
They study diseases.
Neurologists study the nervous system.
It depends on what kind of scientist it is. For example, botanists study plants.
a physist
A herpetologist studies lizzards and snakes.
Zoologists study animals.
Computer Science and IT (Information Technology)
All scientist study science so every one you could think of :)
bio