Christopher Allen Lloyd is an American actor. He has appeared in many theater productions, films, and on television since the 1960s. He is known for portraying Dr. Emmett "Doc" Brown in the Back to the Future trilogy (1985–1990) and Jim Ignatowski in the comedy series Taxi (1978–1983), for which he won two Emmy Awards.

Emmett Lathrop Brown, Ph.D., commonly referred to as "Doc Brown", is a fictional scientist character in the Back to the Future franchise. In the world of the franchise, he is the inventor of the world's first and second time machines, the first constructed using a 1981 DeLorean sports car, and the second constructed using a steam engine locomotive.