The influential artist recognized for their work in conceptual art is Marcel Duchamp. His 1917 piece, "Fountain," which featured a urinal, challenged the notion of what constitutes art. Duchamp's work introduced the idea that the artist's intent and context can define art, rather than just traditional aesthetics. His legacy continues to inspire contemporary artists to explore and redefine artistic boundaries within various mediums. Duchamp's influence is evident in movements such as Pop Art and Installation Art, making him a key figure in the evolution of modern art.