Quantities was written by Darren Dale, with the hope that additional developers will contribute to — and take credit for — its development.

Special thanks to those who have made valuable contributions (roughly in order of first contribution by date)

Charles Doutriaux
wrote the python wrapper for unit conversions with the UDUnits library (no longer used)
Enthought Inc.
the original units registry was developed at Enthought for the Enthought Tool Suite.
John Salvatier
added support for the Quantity iterator, contributed to support for simplified representations of units, comparison operators, and contributed unit tests.
Tony Yu
contributed several bug fixes and contributed to the documentation.