The renowned artist known for their contributions to conceptual art movements is Marcel Duchamp. He is famous for his revolutionary works that challenge traditional notions of art, such as his piece “Fountain,” a urinal presented as art. Duchamp's ideas about the conceptual nature of art paved the way for future movements, such as Pop Art and Minimalism. His impact continues to resonate in contemporary art practices, as he questioned the definitions and boundaries of artistic expression.