Dr. Stefan Bosch, born in 1962, lives in southern Germany and works as an anesthetist and emergency physician. He deals with birds and mammals "on behalf of his own curiosity" since his youth. He lectures and manages field trips for the Naturschutzbund Deutschland (NABU) and is author of numerous scientific and popular scientific articles in professional journals, books and brochures. For over 20 years, he belongs to the editorial staff of the magazine Naturschutz Heute. Squirrels fascinated Bosch from an early age when he met tame specimens in the Black Forest and the Alps. Since then, he observes and photographs them regularly.

Peter W. W. Lurz, Ph. D., lives in Britain and is an internationally renowned expert for squirrels. For over 20 years he is working on squirrels, their ecology, behaviour, and conservation in the UK, Italy and the U.S. His particular passion is the European red squirrel, which runs like a thread throughout his research career. Peter Lurz is one of the few scientists in Europe who deal extensively with the study of the red squirrel. In Great Britain he was and is instrumental in the basic and nature conservation research and develops and supports strategies for the conservation of the remaining squirrels in the British Isles. Current research focuses on conservation, habitat use and influence and impact of invasive species on the indigenous fauna.