A biologist is a scientist who studies cells. They are experts in the field of biology, which is the study of living organisms and their interactions with the environment. Biologists use a variety of methods to study cells, including microscopy, genetics, and biochemistry. They may also use computer models to simulate cellular processes. Biologists often work in laboratories or in the field, conducting experiments and collecting data. Their research can lead to new treatments for diseases, better understanding of how cells work, and improved environmental management.