Top 10 unbelievable historical concurrencies. A cytologist is a medical professional who specializes in the study of cells. He may concentrate his work in the examination of animal cells, plant cells or both.A cytologist normally works in a medical laboratory in a hospital, clinic or medical research company. A microscope is the main tool used by a cytologist.A large part of his work involves sectioning cells and examining them on slides.e may concentrate his work in the examination of animal cells, plant cells or both. A cytologist normally works in a medical laboratory in a hospital, clinic or medical research company. A microscope is the main tool used by a cytologist. A large part of his work involves sectioning cells and examining them on slides.