The program Mandel 5.16 for investigating the Mandelbrot set and other sets from complex dynamics is found here. Interactive demos are included.
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Or see the Java applet Juliette.

Read here about my
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research interests; download papers and preprints: Teaching: 1996–2004 I was a research and teaching assistant
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at the former Institute for Pure and Applied Mathematics, RWTH Aachen University. I have been giving problem sessions on calculus for civil engineering students, Fourier analysis, distributions, differential equations, dynamic systems.

2005–2006 I was a teacher-in-training at the
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Erasmus-von-Rotterdam Gymnasium in Viersen, Germany. On Friday afternoons there was a study group on the Mandelbrot set with my former 11th-grade students.

Since 2007 I am teaching mathematics and physics at the Gesamtschule Aachen-Brand, a community college for grades 5–13, located in Aachen, Germany. Material for students and colleagues is available from ucloud4schools. See a 2019 project on complex dynamics.

Binomial 2.2 is a program for illustrating the binomial probability distribution and its approximation by a Gaussian, and for calculations related to testing of hypotheses. The latest release is available here. Exercise sheets are included in the German version.

My favorite school of psychology is Process Work. Look here for a brief introduction. I have done various trainings in Portland Oregon, Zürich, and Stuttgart. Currently I am enrolled in a three-year program at the Institut für Prozessarbeit Deutschland.