David O'Reilly is an Irish animator and director known for his unique style that blends 3D animation with a hand-drawn aesthetic. He gained recognition for his work on short films like Please Say Something, which won the Golden Bear at the 2009 Berlin International Film Festival. His innovative approach often explores themes of technology and human emotion. In addition to his short films, O'Reilly has contributed to video games, including the critically acclaimed Mountain and Everything. His work is characterized by a playful yet thought-provoking narrative style, making him a notable figure in contemporary animation and digital art.