Surge's original author (version 1.0 - 1.6 alpha):
Claes Johanson <claes@bitwig.com>

Authors in the repository since 1.6 alpha was open-sourced (in alphabetical order):

Raymond Baker <https://github.com/RaymondBaker>
David Bata <https://github.com/tank-trax>
Alexandre Bique <bique.alexandre@gmail.com>
Hendrik van Boetzelaer <http://opuswerk.com>
Davide Callea <davidecallea@gmail.com>
Jatin Chowdhury <jatin@ccrma.stanford.edu>
Jean Pierre Cimalando <jp-dev@inbox.ru>
Filipe Coelho <falktx@falktx.com>
Alec DiAstra <alecdiastra@gmail.com>
Andreya Ek Frisk <andreya.ek.frisk@gmail.com>
Rich Elmes <richie@juic3.com>
The Emu (J Riley Hill) <http://jrileyhill.com>
Matthias von Faber <http://github.com/mvf>
Jani Frilander <http://github.com/janifr>
Amy Furniss <http://github.com/amyfurniss>
Cale Gibbard <cgibbard@gmail.com>
Brian Ginsburg <https://github.com/bgins>
Ben Goldwasser <https://github.com/sadguitarius>
Morgan Kanter <https://github.com/mx>
Nathan Kopp <nk.sg@nathankopp.com>
Korridor <fabian.kempe@gmail.com>
Mario Krušelj a.k.a. EvilDragon <http://github.com/mkruselj>
muhl <https://github.com/mynameismuhl>
Luna Langton <https://github.com/selenologist>
Jacky Ligon <http://jackyligon.com>
Erik-Jan Maalderink <fonkle@gmx.com>
Kjetil Matheussen <k.s.matheussen@notam02.no>
Sean McGoff <https://github.com/SeanMcGoff>
Dave Palmer <itsmedavep@gmail.com>
Adam Raisbeck <sense@i2pi.com>
Naren Ratan <narenr@fastmail.com>
Esa Juhani Ruoho <esaruoho@gmail.com>
Mikko Saarinki <https://github.com/kingston1>
Jarkko Sakkinen <jarkko.sakkinen@iki.fi>
Jeremy Sagan <info@sagantech.biz>
Chad Scarborough <github:ChadScarborough>
Sebastian Schwarzhuber <https://github.com/cannero>
Tejas Singh <https://github.com/tejas1993>
Jeff Smith <whydoubt@gmail.com>
Jon Spruyt <http://jonspru.yt>
Phil Stone <https://github.com/pkstone/>
Markku Tavasti <tavasti@iki.fi>
Paul Walker <paul@pwjw.com>
Keith Zantow <kzantow@gmail.com>
Vincent Zauhar <v.zauhar@bell.net>
簡志瑋 <dppss92132@gmail.com>
Marty Lake <matthieu@talbot.audio>
David Carlier <devnexen@gmail.com>
Xenakios <xenakios@gmail.com>
Alexandr Zyurkalov <Alexander.Zyurkalov@gmail.com>
Morgan Holly <https://github.com/morganholly>
Kinga Janicka <https://kinga.dev>