bcolz has been created by Francesc Alted, so he must be responsible for most of the bugs in the beast. Valentin Haenel did an impressive work working as a maintainer and release manager for long time. Francesc Elies contributed many improvements to bcolz. Gabi Davar contributed a much better setup.py. Also, most of the Python 3 support is a back porting of the work that Mark Wiebe did for the BLZ package. Matthew Rocklin and Phillip Cloud contributed conda and binstar recipes. Alistair Miles contributed the conda-forge recipe and other improvements. Many other contributed bug fixes and new features.