Sometimes you can find me at my office. Unfortunately I'm a worker from the dark side, so it is more than likely that you will not reach me early in the morning (Note: I have a new office and phone-number!):

My email is (attention: basic intelligence needed):

If you have questions concerning whatever you think I'm supposed to know and if the question could be of public interest then you should rather ask here:

• Mathematica's MathGroup
• ChemieOnline Forum
• Matroids Matheplanet