GitPython was originally written by Michael Trier.
GitPython 0.2 was partially (re)written by Sebastian Thiel, based on 0.1.6 and git-dulwich.

Contributors are:

-Michael Trier <mtrier _at_ gmail.com>
-Alan Briolat
-Florian Apolloner <florian _at_ apolloner.eu>
-David Aguilar <davvid _at_ gmail.com>
-Jelmer Vernooij <jelmer _at_ samba.org>
-Steve Frécinaux <code _at_ istique.net>
-Kai Lautaportti <kai _at_ lautaportti.fi>
-Paul Sowden <paul _at_ idontsmoke.co.uk>
-Sebastian Thiel <byronimo _at_ gmail.com>
-Jonathan Chu <jonathan.chu _at_ me.com>
-Vincent Driessen <me _at_ nvie.com>
-Phil Elson <pelson _dot_ pub _at_ gmail.com>
-Bernard `Guyzmo` Pratz <guyzmo+gitpython+pub@m0g.net>
-Timothy B. Hartman <tbhartman _at_ gmail.com>
-Konstantin Popov <konstantin.popov.89 _at_ yandex.ru>
-Peter Jones <pjones _at_ redhat.com>
-Anson Mansfield <anson.mansfield _at_ gmail.com>
-Ken Odegard <ken.odegard _at_ gmail.com>
-Alexis Horgix Chotard
-Piotr Babij <piotr.babij _at_ gmail.com>
-Mikuláš Poul <mikulaspoul _at_ gmail.com>
-Charles Bouchard-Légaré <cblegare.atl _at_ ntis.ca>
-Yaroslav Halchenko <debian _at_ onerussian.com>
-Tim Swast <swast _at_ google.com>
-William Luc Ritchie
-David Host <hostdm _at_ outlook.com>
-A. Jesse Jiryu Davis <jesse _at_ emptysquare.net>
-Steven Whitman <ninloot _at_ gmail.com>
-Stefan Stancu <stefan.stancu _at_ gmail.com>
-César Izurieta <cesar _at_ caih.org>
-Arthur Milchior <arthur _at_ milchior.fr>

Portions derived from other open source works and are clearly marked.