 In 1927 Siedliecki, Derscheid and P.-G. Van Tienhoven of The Netherlands created the International Office for the Protection of Nature ("Centre international de documentation et de correlation pour la protection de la nature") to implement wildlife conservation plans in Europe.Van Tienhoven was the first president, while Jean-Marie Derscheid was named secretary and managed the office until he resigned in 1933.Derscheid wrote a book about their experiences introducing laws for bird conservation that same year.