Prof. Dr. Nico Diederich is a clinical neurologist. He studied at the Universities of Homburg/Saar and Bonn (Germany) and trained in neurology at the University of Cologne (Germany) and at the Rush University, Chicago (USA). He is “Privat-Dozent” for Neurology at the University of Cologne (Germany) and regularly teach at this University. He is also a Visiting Assistant Professor at Rush University and annually return for mini-sabbaticals to this institution. His clinical practice is at the CHL in Luxembourg-City (Luxembourg). His main focus of clinical and scientific interest are movement disorders and sleep disorders. In particular, he is involved in longitudinal studies of various non motor symptoms in early stages of PD and in network analysis of these symptoms.