Question: The Slayers d20 Role-Playing Game is a 2003 role-playing game published by a Canadian company founded by who?

Context paragraphs:
Castles &amp; Crusades: Castles & Crusades (C&C) is a fantasy role-playing game published in 2004 by Troll Lord Games based upon a stripped-down variant of the d20 System by Wizards of the Coast.  The game system is designed to emulate the play of earlier editions of the "Dungeons & Dragons" game while keeping the unified mechanics of the d20 System.

Slayers Royal: Slayers Royal (スレイヤーズろいやる , Sureiyāzu roiyaru ) is a 1997 tactical role-playing game developed by Kadokawa Shoten and published by Entertainment Software Publishing only in Japan.  It was originally released for the Sega Saturn on July 25, 1997, and its PlayStation port by Japan Art Media was released on April 23, 1998.  "Slayers Royal" was the third video game adaptation on the "Slayers" franchise and the first that featured the full motion video cut scenes and voice actors from the anime versions.  This well-received game was followed by a non-sequel "Slayers Royal 2" in 1998.

The World of Indiana Jones: The World of Indiana Jones is a role-playing game published by West End Games, based on the Indiana Jones franchise.  West End Games acquired the rights to publish an Indiana Jones role-playing game ten years after the publication of TSR's "The Adventures of Indiana Jones Role-Playing Game" (1984).

Blue Rose (role-playing game): Blue Rose is a fantasy role-playing game published by Green Ronin Publishing in 2005.  The game is in the romantic fantasy genre—it is inspired by fantasy fiction such as that of Mercedes Lackey and Diane Duane as opposed to Robert E. Howard–style of swords and sorcery.  In romantic fantasy the emphasis is on role-playing and character interaction more than on combat.  The game uses a derivative of the D20 system, called True20.  Blue Rose won the Gen Con ENWorld Roleplaying Silver Medal for Best Rules in 2005.  Green Ronin subsequently released True20 as a separate system without a setting and genre neutral.

Advanced d20 Magic: Advanced d20 Magic is an alternative spellcasting system for the "Dungeons and Dragons" role-playing game and the d20 System role-playing game.  It is published by Guardians of Order, the producers of the Big Eyes Small Mouth game and the Slayers d20 game.  The system presents a DC-based Magic System similar to the Sovereign Stone game published by Sovereign Press.

Dragonstar: Dragonstar is a science fantasy game created by Fantasy Flight Games for Wizards of the Coast's D20 role-playing game system.

Slayers Royal 2: Slayers Royal 2 (スレイヤーズろいやる2 ) is a tactical role-playing game developed by Onion Egg and published by Entertainment Software Publishing and Kadokawa Shoten in 1998 for the Sega Saturn and in 1999 for the PlayStation, exclusively in Japan.  It is a follow-up to 1997's "Slayers Royal" but is a standalone story in the "Slayers" franchise and not a direct sequel.  The game sold well, but its reviews were mostly only moderately positive.

The Slayers d20: The Slayers d20 Role-Playing Game is a 2003 role-playing game published by Guardians of Order based on the anime series "Slayers".  The title refers to the title under which Central Park Media released the three seasons of the television series.

D20 Future: d20 Future is an accessory for the "d20 Modern" role-playing game written by Christopher Perkins, Rodney Thompson, and JD Wiker.  It facilitates the playing of campaigns in the far future, using elements such as cybernetics, mecha, mutations, robotics, space travel, starships, and xenobiology.  "d20 Future" is one of the most extensive of science-fiction d20 games, and has its own SRD, being a source for many other sci-fi d20 games.

Guardians of Order: Guardians of Order was a Canadian company founded in 1996 by Mark C. MacKinnon in Guelph, Ontario.  The company's business output consisted of role-playing games (RPGs).  Their first game is the anime inspired "Big Eyes, Small Mouth".  In 2006 Guardians of Order ceased operations due to overwhelming debt.

Supporting paragraphs: The Slayers d20 Guardians of Order
Answer: Mark C. MacKinnon