2000 Clark Cooper
2000-2017 Expat development team
1992-2018 Free Software Foundation,Inc
2008 Guido U. Draheim
2011 Maarten Bosmans
2014 Mike Frysinger
2016-2017 Steve Holme
1997-2000 Thai Open-Source Software Center Ltd
1998-2017 Thai Open-Source Software Center,Clark Cooper,and the Expat maintainers
2018 The Expat Authors
1994 X Consortium