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 
-Alan Briolat
-Florian Apolloner 
-David Aguilar 
-Jelmer Vernooij 
-Steve Frcinaux 
-Kai Lautaportti 
-Paul Sowden 
-Sebastian Thiel 
-Jonathan Chu 
-Vincent Driessen 
-Phil Elson 
-Bernard `Guyzmo` Pratz 
-Timothy B. Hartman 
-Konstantin Popov 
-Peter Jones 
-Anson Mansfield 
-Ken Odegard 
-Alexis Horgix Chotard
-Piotr Babij 
-Mikul Poul 
-Charles Bouchard-Lgar 
-Yaroslav Halchenko 
-Tim Swast 
-William Luc Ritchie
-David Host 
-A. Jesse Jiryu Davis 
-Steven Whitman 
-Stefan Stancu 
-Csar Izurieta 
-Arthur Milchior 
-Anil Khatri 
-JJ Graham 
-Ben Thayer 
-Dries Kennes 
-Pratik Anurag 
-Harmon 
-Liam Beguin 
-Ram Rachum 
-Alba Mendez 
-Robert Westman 
-Hugo van Kemenade
-Hiroki Tokunaga 
-Julien Mauroy 
-Patrick Gerard
-Luke Twist 
-Joseph Hale 
-Santos Gallegos 
-Wenhan Zhu 
-Eliah Kagan 
-Ethan Lin 
-Jonas Scharpf 
-Gordon Marx
-Enji Cooper

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