Joseph Conrad was a Polish author who wrote in English after settling in England. He was granted British nationality in 1886, but always considered himself a Pole.
Conrad is regarded as one of the greatest novelists in English, though he did not speak the language fluently until he was in his twenties (and always with an accent). He wrote stories and novels, often with nautical settings, which depict trials of the human spirit in the midst of an indifferent universe. He was a master prose stylist who brought a distinctly non-English sensibility into English literature.
Below is a trailer for the film The Secret Agent based on his book of the same name: