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Here's a biographical sketch from the front of the book:
'Raymond Peynet was born in Paris in 1908. His first cartoon was published in the Boul'vardier, an English journal intended for English residents in Paris, when he was only twenty-two. He continued to illustrate books and publish cartoons until the war, since which his drawings have appeared in Ric & Rac, France-Dimanche, Ici-Paris, Le Rire, and, for the past ten years, in Lilliput, Men Only, and other journals in England, Germany and Denmark. He has also designed the décor fro a number of theatrical productions, including Love's Labour's Lost in French, and both décor and costumes for ballet, apart from numerous poster designs for films and advertising... Raymond Peynet married the original and only 'Elle' - an art student named Denise - and they live happily ever after, with their daughter, in a flat in Paris and a restored chateau in the south of France.'
Of course he didn't actually live forever, happily or otherwise. He died in 1999, three years after his wife. He's not on Wikipedia (the English language version), but you can read a more up-to-date biography in this Obituary from the Independent.