Question: Who were the founders of the studio acquired on February 1, 2017 by the owners of Arkane Studios?

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Harvey Smith (game designer): Harvey Smith (born 1966) is an American video game designer and writer, currently working at Arkane Studios.

Dishonored: Death of the Outsider: Dishonored: Death of the Outsider is an action-adventure stealth video game developed by Arkane Studios and published by Bethesda Softworks.  It is the third game in "Dishonored" series, following "Dishonored 2", and was released 15 September 2017 on Microsoft Windows, PlayStation 4 and Xbox One.  It follows former-assassin Billie Lurk as she finds her mentor Daud and aids in his quest to kill the Outsider, a supernatural being who bestows magical powers on a select few.

Raphaël Colantonio: Raphaël Colantonio (Born 1971) is a French-born video game developer, and was the founder and 18-year president of Arkane Studios.  He has served as creative director on several of Arkane's titles, including co-creator with Harvey Smith for the "Dishonored" series.

Dishonored: Dishonored is a 2012 stealth action-adventure video game developed by Arkane Studios and published by Bethesda Softworks.  Set in the fictional, plague-ridden industrial city of Dunwall, "Dishonored" follows the story of Corvo Attano, bodyguard to the Empress of the Isles.  He is framed for her murder and forced to become an assassin, seeking revenge on those who conspired against him.  Corvo is aided in his quest by the Loyalistsa resistance group fighting to reclaim Dunwall, and the Outsidera powerful being who imbues Corvo with magical abilities.  Several noted actors including Susan Sarandon, Brad Dourif, Carrie Fisher, Michael Madsen, Lena Headey and Chloë Grace Moretz provided voice work for the game.

Bethesda Softworks: Bethesda Softworks LLC is an American video game publisher based in Rockville, Maryland.  The company was founded by Christopher Weaver in 1986 as a division of Media Technology Limited, and in 1999 became a subsidiary of ZeniMax Media.  In its first fifteen years, it was a video game developer and self-published its titles.  In 2001, Bethesda spun off its own in-house development team into Bethesda Game Studios, and Bethesda Softworks became a publisher only.  It currently also publishes games by ZeniMax Online Studios, id Software, Arkane Studios, MachineGames, Tango Gameworks and BattleCry Studios.

The Crossing (video game): The Crossing was a first-person shooter video game by Arkane Studios, which attempted to fuse single-player and multiplayer by threading its single-player campaign through live multiplayer games.

ZeniMax Media: ZeniMax Media Inc. is an American media company.  The company is known for owning Arkane Studios (developer of "Dishonored" and "Prey"), BattleCry Studios (developer of "BattleCry"), id Software (developer of the "Doom" and "Quake" series, and "Rage"), MachineGames (developer of ""), Tango Gameworks (developer of "The Evil Within"), Bethesda Softworks with its Bethesda Game Studios (developer of "The Elder Scrolls" and "Fallout" series) and ZeniMax Online Studios (developer of "The Elder Scrolls Online").  ZeniMax is headquartered in Rockville, Maryland, with offices in Asia / Asia Pacific, Australia and Europe (Germany, France, Benelux).

Arkane Studios: Arkane Studios SASU is a French video game developer based in Lyon, France.  It was founded in 1999, and released its first game, "Arx Fatalis", in 2002.  Arkane Studios opened a second studio, Arkane Studios Austin, in Austin, Texas in July 2006.

Escalation Studios: Escalation Studios LLC is an American video game developer based in Dallas, Texas, founded in 2007 by Tom Mustaine and Marc Tardif.  On February 1, 2017, Escalation Studios was acquired by ZeniMax Media, the parent company of American publisher Bethesda Softworks.

Prey (2017 video game): Prey is a first-person shooter video game developed by Arkane Studios and published by Bethesda Softworks.  The game was released worldwide on 5 May 2017, for Microsoft Windows, PlayStation 4 and Xbox One.

Supporting paragraphs: Escalation Studios ZeniMax Media
Answer: Tom Mustaine and Marc Tardif