Employed at the RPTU Kaiserslautern-Landau (formerly TU Kaiserslautern), Germany, as a professor in algorithmic algebra; working on Kac-Moody groups on the one hand, computer algebra (with a focus on computational group theory, based on GAP) on the other hand. Using Julia; OSCAR & GAP developer
Mathematics
Q&A for people studying math at any level and professionals in related fields
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Stack Overflow
Q&A for professional and enthusiast programmers
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Physics
Q&A for active researchers, academics and students of physics
Academia
Q&A for academics and those enrolled in higher education
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Arduino
Q&A for developers of open-source hardware and software that is compatible with Arduino
Politics
Q&A for people interested in governments, policies, and political processes
History of Science and Mathematics
Q&A for people interested in the history and origins of science and mathematics
Computer Science
Q&A for students, researchers and practitioners of computer science
The Workplace
Q&A for members of the workforce navigating the professional setting
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Retrocomputing
Q&A for vintage-computer hobbyists interested in restoring, preserving, and using the classic computer and gaming systems of yesteryear
User Experience
Q&A for user experience researchers and experts
Reverse Engineering
Q&A for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation
Arqade
Q&A for passionate videogamers on all platforms
Server Fault
Q&A for system and network administrators
Information Security
Q&A for information security professionals
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Code Review
Q&A for peer programmer code reviews
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Super User
Q&A for computer enthusiasts and power users
Ask Different
Q&A for power users of Apple hardware and software
Ask Ubuntu
Q&A for Ubuntu users and developers
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Interpersonal Skills
Q&A for people looking to improve their interpersonal communication skills