Angelika Langer works as a freelance instructor and courseware developer. Previously, she was a senior trainer and developer at Rogue Wave Software, Inc. She also worked for a compiler group at Siemens, where she was responsible for the C++ compiler's standard library. She is a frequent speaker at international object-oriented conferences and was a member of the ISO/ANSI C++ standards committee.
Klaus Kreft is a Senior Consultant at Siemens Business Services. He was previously a senior consultant at Rogue Wave Software, Inc., and system architect at Siemens. Together with Angelika Langer he writes a regular column on the Standard C++ Library for C++ Report.