Dr. Finklestein is a brilliant yet eccentric scientist residing in Halloween Town in 'The Nightmare Before Christmas.' Known for his distinctive appearance, with a duck-like beak and a wheelchair, he is the creator of Sally, a ragdoll-like character. Despite his intelligence and inventiveness, he is often portrayed as possessive and controlling, especially towards Sally. His character adds a layer of dark humor and complexity to the story, embodying the classic trope of the mad scientist. Dr. Finklestein plays a significant role in the Halloween Town community with his scientific expertise.