Contact Information

Automatically generated (Refereeing) requests by email will be considered spam and deleted unread. Absolutely no exceptions. Read the Refereeing Policy first.

Office Mathematikzentrum, R 1.033
lesch@math.uni-bonn.de
ph +49 228 73 7641 (Secr. ext 2204). I am hearing impaired. Therefore, phone calls should be prearranged by email. Please limit unsolicited phone calls to exceptional circumstances only.

Email lesch@math.uni-bonn.de
pgp encrypted emails are welcome and encouraged:
My pgp key fingerprint: 2BCF FA29 ADD4 1756 BA44 2DE9 B345 5CEE 8510 B24B
You find the key on the ubuntu key server
I maintain an Email Blacklist. Check first before sending an email.

Refereeing Policy If you want me to referee a paper please deliver the paper in pdf format as mail attachment together with a nicely written personal email. Please also check my email Blacklist. Automatic mails from noreply addresses and/or by editoral manager systems will be considered spam (they are a plague, in particular their automatic reminders), in particular editorialmanager.com is on my blacklist and you cannot send me emails from there! Don't try to ask me to fill in web forms on commercial publishing websites as this will delay processing indefinitely. Referees don't get paid, so publishers have no right to impose a certain workflow. I will deliver my report by mail attachment to a human editor, not to a machine. By sending a referee request you implicitly agree to this Refereeing Policy, if not I cannot referee for you (sorry). Refereeing for Elsevier journals only among friends: friends know, if you don't know, don't even try.

Mail Address Endenicher Allee 60, Mathematisches Institut, Universität Bonn, Endenicher Allee 60, D - 53115 Bonn

Inquiries – Communication Guidelines

The following notes outline my preferences and boundaries regarding professional correspondence. They are intended to ensure clarity, efficiency, and mutual respect in communication. Items in German are intended for German-speaking readers; others may disregard them.

• Questionnaires — I do not participate in unsolicited online surveys or questionnaires, regardless of their claimed brevity. Mass mail requests of this nature, often followed by automated reminders, will not receive a response.
• Opening remarks on health and well-being — Professional correspondence from unknown senders should avoid personal inquiries such as „I hope this email finds you in good health and spirits.“ In German business culture, such remarks are considered inappropriate. My personal well-being is outside the scope of a professional exchange, and opening with such a phrase does not strengthen an application or request.
• Gendered language — I prefer to be addressed as „Herr Lesch“ in German correspondence. Please refrain from using gender-neutral innovations such as „Dozierender“ in this context. Ich bin „Dozent“; „dozierend“ bin ich während der Vorlesungsstunden.
• Inclusion — As a person with a disability, I note that inclusion efforts in professional and academic settings still significantly lag behind diversity initiatives. This observation is based on my personal experience.