Nikolaus is a Visiting Scholar on the CROYAN project at the musée du quai Branly - Jacques Chirac thanks to a grant from the Terra Foundation for American Art. He has lectured at the Ruprecht-Karls-Universität, Heidelberg, and the Goethe-Universität, Frankfurt am Main, Germany, where he received his Ph.d. in 2013 (on the history of Wampum, published in 2016). Since 2010 he also contributes to the international research project GRASAC (Great Lakes Research Alliance for the Study of Aboriginal Arts and Cultures). In 2009 he was a freelance researcher for the department of the Americas at the Museum der Weltkulturen in Frankfurt. He frequently visits museums containing ethnographic material in Europe and elsewhere. His focus is on the history and aboriginal cultures of North America on which he has published several articles.