Rainer Grimm has worked as a software architect, team lead and instructor for about 20 years. In his spare time, he likes to write articles about C++, Python, and Haskell. Rainer Grimm also likes to speak at conferences. He publishes weekly on his English and German blog "Modernes C++". Heise Developer hosts the German blog.
Now he is an independent instructor giving seminars about modern C++ and Python. He published several books in various languages to modern C++ and concurrency, in particular.
Concepts in C++20: A Evolution or a Revolution