Theodore Dreiser (1871-1945) was a prominent American journalist and novelist who made important contributions to the literary naturalism movement. Dreiser was born in Terre Haute, Indiana, on August 27, 1871, and was raised in a working-class household. His early life and difficulties with poverty had a big impact on the writing he produced later. Because of his novels' candid depictions of sexuality and social issues, Dreiser faced criticism and restriction, but his writings were vital in forming American literature. His naturalistic approach deviated from popular literary traditions by highlighting the impact of environment and genetics on human behavior. In addition, Dreiser was a journalist who wrote for magazines including Harper's Magazine and The New York Times. Throughout his career, he participated in literary and political circles and was an advocate for social justice. On December 28, 1945, Theodore Dreiser passed away. He is remembered for being a significant figure in American literature and a forerunner of literary naturalism.