Paul Lennart Hellsing, born 5 June 1919 in Västanfors in Fagersta, Sweden as the son of the merchant Paul Hellsing and his wife Sigrid, née Rohloff, whose mother was a mulatto from West India. Lennart Hellsing is a Swedish author and translator. He is a prolific writer of children's literature, particularly known for his rhymes and word plays. He is considered an "outstanding poet" in the field of humour and nonsense writing. In 1987, he received the Grand Prize from Samfundet De Nio.
Hellsing has been married to actress Yvonne Lombard since 1953.