Andrew R. Koenig (born June 1952) is a former AT&T and Bell Labs researcher and programmer. He is the author of C Traps and Pitfalls, co-author (with Barbara Moo) of Accelerated C++ and Ruminations on C++, and his name is associated with argument-dependent name lookup, also known as "Koenig lookup". He served as the Project Editor of the ISO/ANSI standards committee for C++, has authored over 150 papers on C++, and is listed as inventor on four patents.