Batchelor responded to Halas 's advertisement for an assistant , and they founded Halas and Batchelor in 1940 to create war information and propaganda films .
After independent careers in animation , Halas and Joy Batchelor began working together in 1938 .
Joy Batchelor responded to Halas 's advertisement for an assistant , and they founded Halas     in 1940 to create war information and propaganda films .
After independent careers in animation , Halas and Joy Batchelor began working together in 1938 .