 Him and Le Witt worked together in Poland for several years before, in 1937, they relocated the Lewitt-Him design business to London, following an exhibition of their work there by the publishers Lund Humphries.The pair quickly gained commercial contracts with London Transport and Imperial Airways as well as illustrating children's books, such as "The Little Red Engine Gets a Name" (1942) by Diana Ross.In London during World War II the partnership received notable commissions for information and public safety posters from, among others, the General Post Office, the Royal Society for the Prevention of Accidents and the Ministry of Information.