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 or Fronter.

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.