For an up to date publication list, consult the Phone book entry.
There is also information on Google Scholar.
Christian's ORCID identifyer is https://orcid.org/0000-0003-3609-9594
Things that evolve over time, can sometimes be described with differential equations or difference equations. The field of Mathematics dedicated to the study of these equations is called dynamical systems. It is in this field Christian spends most of his time.
More specifically he looks at what happens when you apply the same mapping again and again, that is, iterate a mapping f. If you think about this, and the mapping in question is analytic, you are actually in Holomorphic Dynamics.
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Christian has also dabbled in applied mathematics.
He is co-organizing some of the European Study Groups with Industry.
A picture can give another handle to grasp a mathematical object. Often are geometric intution can lead us to results that would otherwise have escaped us.