MapCore in the industry as of March 2014:
Scroll all the way down to view freelance contractors:
Aberrant Entertainment: (Brisbane, Australia)
Nick "Tarky" Marden
Aquiris: (Porto Alegre, Brazil)
Arthur "Arhurt" Bobany - Game Designer
Arkane Entertainment (Lyon, France)
Valentin "3Dnj" Levillain - Level Architect
Marc "moroes" Bidoul - Level Architect
Avalanche Studios (NYC, USA)
Mr.P - Senior Developer - World Design
Black Tusk Studios (Vancouver, Canada)
Martin "Alf-Life" Badowsky - Level Designer
Blitz Communications: (London, England)
Chris "CrazyMAC" Tufnell
Blizzard Entertainment: http://www.blizzard.com/ (Irvine, California)
Bram "Pericolos0" Eulaers - Environment Artist
Kris "Tofu" Howl - Level Designer
Simon "IxenonI" Fuchs - Senior Environment Artist
Thiago "Minotauro" Klafke - Environment Artist
Philip "PhilipK" Klevestav - Environment Artist
Hélder "[HP]" Pinto - 3D Environment Artist
Boomlagoon Ltd (Helsinki, Finland)
Arttu 'skdr' Mäki - VP, Design
Bungie: (Seattle, Washington)
Dan "Algor" Grafstrom
Andrew "KungFuSquirrel" Weldon
CD Projekt Red en.cdprojektred.com (Warsaw/ Cracow, Poland)
Mark "Jenn0_Bing" Foreman - Environment Artist
Kacper "knj" Niepokólczycki - Environment Artist
Cloud Imperium Games: https://www.cloudimperiumgames.com/
John "Ginger Lord" Crewe - Senior Technical Designer
Will "Vilham" Josephy - Level Designer
Codeglue: (Rotterdam, The Netherlands)
Gorion - Game Programmer
Codemasters: http://www.codemasters.com/UK
Beck - Level Designer
Jordan "Jord" Woodward - Level Designer
Peter "Urgaffel" Åsberg - Environment Artist
Creative Assembly: (London, England)
Liam "PogoP" Tart - Environment Artist
Mark "marks" Sneddon - Technical Artist
Crytek: http://www.crytek.com/ (Frankfurt, Germany)
Chris "Narby" Auty - Lead Level Designer
Christian "freakadelle" Bliss - Level Designer
Hussein "Huss" Dairi - Level Designer
Frieder 'e-freak' Erdmann - Cinematic Technical Artist
Sascha "Harefort" Herfort - Junior Technical Artist
Clement "Corwin" Melendez - Level Designer
Deep Silver Dambuster Studios: (Nottingham, England)
Paul "PaulH" Haynes - Senior Level Designer
DICE: http://www.dice.se/ (Stockholm, Sweden)
Lukas "Chimeray" Van Daele - Level Designer
Anders "Evert" Jansson - Level Designer
Oskmos - Artist/Modeler
Anders "Pampers" Schei - Technical Artist
Rick "Rick_D" Underhill - Environment Artist
Digital Extremes: http://www.digitalextremes.com/ (London, ON, Canada)
Joey "Erratic" Adey
Ted "cashed" McIlwain - level designer
EA Motive: http://www.ea.com/motivestudios/ (Montreal, Canada)
Nick "Dark" King - Senior Level Designer
Eegeo: http://www.eegeo.com/ (Dundee, Scotland)
Mark "Defrag" Simpson - Software Engineer
Eidos Montreal: http://www.eidosmontreal.com/ (Montreal, QC, Canada)
Sylvain "channie" Douce - Level Designer
Robbert-Jan "Nysuatro" Brems - Technical Artist
Epic Games: http://epicgames.com/ (Raleigh, NC, USA)
Chris "2d-Chris" Kay - Level Designer
Escalation Studios: (Austin, Texas)
Austin "Setin" House - Designer
Gameloft: http://www.gameloft.com (New Orleans, USA & Barcelona, Spain)
Sam "SamCom" Combs - Game Designer
Peter "Pete_H" Harries - Game Designer
Gearbox: http://www.gearboxsoftware.com/ (Plano, Texas)
Nathan "TomWithTheWeather" Overman - Level Designer
Mike "zilla" Neumann - Creative Director / Writer
Brian "Fletch" Thomas - Cinematic Designer
Zach "von*ferret" Ford - Level Designer
Goodgame Studios: http://www.goodgamestudios.com/ (Hamburg, Germany)
Friedrich "FrieChamp" Bode - Level Designer
Guerrilla Games: http://www.guerrilla-games.com/ (Amsterdam, The Netherlands)
Arjan "IR" Bak - Lead Environment Artist
Ryan "Zeta" Spinney - Junior Environment Artist
Haiku Interactive - (Edimburgh, Scotland)
Duncan "ReNo" Blair - Level Designer
id Software http://www.idsoftware.com/ (Mesquite, Texas)
Yan "Method" Ostretsov - Level Designer
Chuck "atrocity" Wilson - Level Designer
Industry consultant (Los Angeles, California)
Jeremy "Izuno" Miller
Interwave Studios: http://www.interwavestudios.com
Douglas "Skybex" Hamilton - Environment Artist
Matthias "Steppenwolf" Schmidt - Environment Artist
[AoS]Albatros
IO Interactive (Copenhagen, Denmark)
Martin "Sentura" Colith - Level Designer
Mathias "Fuzyhead" Windrat - Environment Artist
Jagex
Aaron "Psy" Garcha - Junior Level Designer
Junction Point http://www.junctionpoint.com/ (Austin, Texas)
Patrick "Mojo" Krefting - Level Designer
Keen Games (Frankfurt, Germany)
Florian "Strogg" Oswald - Artist
Krysalide Studios (Lyon, France)
Richard "KoKo5oVaR" Malinar
MegaPop Games: (Oslo, Norway)
Skjalg Maehre - Programmer
Monolith (Seattle, USA)
Jed "Graktauk" Bellini - Senior Designer
New World Interactive
Matthias "Steppenwolf" Schmidt - Level Designer
Next Games: http://www.nextgames.com/ (Helsinki, Finland)
Toni "Sota Poika" Seppänen - Junior Level Designer
NimbleBit: http://www.NimbleBit.com (California)
David "Zaphod" Marsh - Designer / Artist
Overkill Software: (Stockholm, Sweden)
Jason "Generalvivi" Mojica - Senior Level Designer
Pandora Studio: (Zagreb, Croatia)
Nikica "gwaijd" Petrusic - Environment Artist
Pure FPS: (Los Angeles, CA)
Matthew "Bawwwcas" Barcas - Level Designer
Pyro Studios: http://www.pyrostudios.com/ (Madrid, Spain)
Juan Fdez. de Simón "Spartan"
Ready at Dawn
ChopperDave - Programmer
Respawn Entertainment: (Encino, California)
Alexander "AlexRoyce" Roycewicz - Senior Level Designer
Geoffrey "CompoSITe" Smith - Senior Game Designer
Mohammad "BadMofo" Alavi - Senior Level Designer
RockAByte: http://www.rockabyte.com/ (Cologne, Germany)
Thomas "hessi" Heß - Software Developer
Rovio (Espoo, Finland)
Sami "Teeluu" Lindqvist - Level Designer
SCEE: (London. England)
James "JamesL" Lane - Lead Designer
"Merkaba"
Space Ape:
Alexander "Taylor" Taylor - Game Designer
Stainless Games: http://www.stainlessgames.com/ (Newport, England)
"tomdon"
Starbreeze Studios:- http://www.starbreeze.com/ (Uppsala, Sweden)
Teddy "TeddyBear" Bergsman - System Engineer
Claes "Nurb" Engdal - Texture Artist
Sucker Punch Productions: (Bellevue, WA, USA)
Francois "Furyo" Roughol - Senior Mission Designer
SuperSledge (Sweden)
Ilijac "Tailgunner" Petrusic - Level Designer
Toltec Studios: http://www.toltecstudios.com/
Sjoerd "Hourences" De Jong - Creative Director and Project Lead
Patrick "Patrick_H" Haslow - Level Designer
Top Free Games (Sao Paulo, Brazil)
Al Anselmo - QA Tester
Treyarch
Werner Martin "xfckup" Eggers - Level designer
Mateusz 'seir' Piaskiewicz - Senior Level Artist
G. Henry "Slowdevelopment" Schmitt - Level designer
Sky Silcox - Game Designer
Ubisoft Montpellier: http://www.ubi.com/ (Montpellier, France)
Julien "Shad" Chevallier - Game Designer
Ubisoft Toronto: http://www.ubi.com/ (Toronto, ON, Canada)
Adam Bromell - Team Lead Artist
Jobye-Kyle "Deceiver" Karmaker - Level Artist
Zombie - Level Designer
Ultra Ultra (Copenhagen, Denmark)
Morten "Mazy" Hedegren - Game Designer
Unknown Worlds: http://www.unknownworlds.com/ns2/
Oliver "Dux" Hobbs - Level designer
Andrew "Wacko" Spiering - Programmer
United Front Games: (Vancouver, Canada)
Alex "AlexM" McGilvray - Engineer
Valve (Bellevue, Washington, USA)
Magnar "insta" Jenssen - Level Designer
W!: (Netherlands)
Erik "Whoot" Bakker
Yager: (Berlin, Germany)
Dan "Daze" Banefelt - Senior technical designer
Lenz "PenE" Monath - Environment Artist
Freelance contractors:
Lee "Lee3dee" Amarakoon
Tobias "WitchKing" Bodlund
Sjoerd "Hourences" De Jong - Experienced Level Designer, Teacher
Henning "Sa74n" Horstmann
Michael "Zacker" Schmidt - Programmer