An epistemologist is a philosopher who studies the nature, origin, and limits of knowledge. They explore questions such as what it means to know something, how we acquire knowledge, and what justifies our beliefs. This field of philosophy is essential for understanding how we perceive reality and make sense of the world around us. Epistemologists often engage with concepts like justification, belief, and truth. They may analyze different sources of knowledge, such as empirical evidence and rational thought, to determine how these contribute to our understanding. Their work helps clarify the foundations of knowledge in various disciplines, including science and ethics.