is Codirector of the Max Planck Institute for Mathematics in the Sciences in Leipzig, Germany, an Honorary Professor at the Department of Mathematics and Computer Sciences at Leipzig University, and an External Faculty Member of the Santa Fe Institute for the Sciences of Complexity, New Mexico, USA.
He is the author of a number of further Springer textbooks including
Postmodern Analysis
(1997, 2002, 2005),
Compact Riemann Surfaces
(1997, 2002, 2006),
Partial Differential Equations
(2002, 2007, 2013),
Differentialgeometrie und Minimalflächen
(1994, 2007, 2014, with J. Eschenburg),
Dynamical Systems
(2005),
Mathematical Concepts
(2015), as well as several research monographs, such as
Geometry and Physics
(2009), and many publications in scientific journals.