Claire McElfatrick is a former greetings card designer who now works on children's books. Her gorgeous illustrations can be seen in all the titles in this series. Her enchanting, detailed illustrations are woven in with photographs to create an effective, accurate image for children.For The Magic and Mystery of TreesDr Jen Green is a writer and editor mainly specializing in geography, history, nature / environment and social issues. She also writes on science, human body, survival, art and artists. She has written over 250 published books, mostly for children aged 5-15 but also for adults.For The Book of Brilliant Bugs and Earth's Incredible OceansJess French is an insect expert, nature lover, TV presenter, author, and qualified vet who loves visiting her Dad's bug farm. She is known for her show on CBeebies, called 'Minibeast Adventure with Jess', which encourages children to explore the outdoors and get to know the bugs around them. Her previous DK book, What a Waste, tackles the subject of sustainability for children. She is a keen conservationist and has a strong passion for the animal world.For The Frozen WorldsJason Bittel is a science writer based in Pennsylvania, USA. He writes mostly about animals, and is passionate about getting people to connect with the wonder around them. He writes for publications including National Geographic, The Washington Post, and The New York Times, and has written a children's book, How to Talk to a Tiger... And Other Animals.