Opal Dunn is widely known as a specialist in books on early first and second language development. She has been a consultant to the Council of Europe on children's bilingual education and acts as consultant to the British Council's LearnEnglish Parents programme. She has been short-listed for the Eleanor Farjeon award for services to children's literature and in 2008 received the Japanese Order of the Rising Sun for over 30 years work with bilingual Japanese children. Opal's books for Frances Lincoln are Acker Backa Boo, El Gato Leo Goes to School, El Gato Leo Comes to Play, Leo le Chat Goes to School, Leo le Chat Comes to Play, Hippety-hop, Hippety-hay, Un Deux Trois and Number Rhymes to Say and Play. She lives in South London.

Patrice Aggs was born and brought up in the United States, but now lives in West Sussex, England. She has illustrated over thirty-five picture books for children. In the early 1980s she was part of the team which produced the animated film The Snowman.

Patrice is currently writing picture books, illustrating and printmaking. She lives on a farm in West Sussex with her husband and two teenagers. The Giraffe Who Came to Dinner is the first book she has both written and illustrated. Her latest books, Ooh La Booga Bomp and Strawberry Squirt are part of the popular O'Brien Pandas series.