The following have made notable contributions to the Elgg Project.
(List in alphabetical order.)

Steve Clay - http://www.mrclay.org/, https://twitter.com/mrclay_org

Cash Costello - cash@elgg.org, http://cashcostello.com/

Pete Harris - http://www.peteharris.co.uk/

Kevin Jardine - http://radagast.biz/

Jon Maul - MITRE http://www.mitre.org/

Marcus Povey - http://marcuspovey.co.uk/

Brett Profitt - brett@elgg.org, http://twitter.com/brettprofitt

Nathan Rackliffe - MITRE http://mitre.org/

Tom Read - MITRE http://mitre.org/

Justin Richer - MITRE http://mitre.org/

Dave Tosh - davidgtosh@gmail.com, http://twitter.com/davetosh

Ben Werdmuller - http://benwerd.com/

Nicholas Whitt - nick.whitt@gmail.com, http://twitter.com/nogoodnick

Evan Winslow - evan@elgg.org, http://evanwinslow.com/