Professor for Zoology and Curator of Herpetology at the Leibniz Institute for the Analysis of Biodiversity Change. He developed an interest in herpetology early on and luckily could pursue the topic in his professional career. He studied at Universität Tübingen and University of California Berkeley and received his doctorate degree from Universität Tübingen, Germany. Mainly trained as morphologist, he fell in love with the rainforest and frogs on the island of Borneo in 2001 and has pursued biodiversity research topics there since. His scientific work includes many international journal articles. Haas conducted field work in Argentina, Australia, European countries, Indonesia, Malaysia. and USA.