Question: Ghostbusters was designed by which American game designer?

Context paragraphs:
Sandy Petersen: Carl Sanford Joslyn "Sandy" Petersen (born September 16, 1955) is an American game designer.

Ghostbusters (role-playing game): Ghostbusters is a comedy role-playing game designed by Sandy Petersen, Lynn Willis and Greg Stafford and published by West End Games in 1986.  It is based on the 1984 film "Ghostbusters".

Chuck Jordan (game designer): Charles "Chuck" Jordan is an American game designer, writer, and programmer.  He co-wrote "The Curse of Monkey Island", wrote three episodes of "Sam & Max Save the World", was the lead writer and co-designer of "Sam & Max Beyond Time and Space", designed and co-wrote two episodes of "Strong Bad's Cool Game for Attractive People", and was the designer of "", as well as season lead designer for the "" season on the whole.

Marco Donadoni: Marco Alberto Donadoni (born in Milan, 8 November 1951) is an Italian game designer.  He designed his first, self-produced wargame, "Iliad", in 1977; he then joined the Italian company International Team (IT), that at the time was mainly a jigsaw puzzle producer.  IT published "Iliad" and changed its core business, focusing on the wargame market, with Donadoni being its main game designer.  Between the late 1970s and the early 1980s, Donadoni created a number of games for IT, some of which, like "Zargo's Lords" and "Kroll & Prumni", were very successful and largely contributed to popularize wargaming in Italy and other European countries, such as France.  Angelo Porazzi, designer of "Warangel" (one of the most popular Italian wargames of recent years) has often cited Donadoni's work as one of his major sources of inspiration.  Donadoni remained as IT's main game designer until the company went bankrupt in the late 1980s, designing more than a hundred games.  After that, he collaborated with several other major Italian game companies such as Editrice Piccoli, Editrice Giochi and others.

Steve Feak: Steve Feak (born August 1, 1984), better known by the in-game name Guinsoo, is an American game designer.  He was one of the previous designers of the popular "" custom game mode, "DotA: Allstars".  Feak attracted the attention of the game industry and Riot Games, when his mod was played by 10 million gamers.  He began this project while studying computer science at the University of Wisconsin.  Since then, Feak was employed by Riot Games as a game designer for "League of Legends", a multiplayer online battle arena (MOBA) game directly inspired by his previous work.

Ray Game Designer 2: Ray Game Designer 2 (also known as RGD2) is a freeware application designed for developing simple 3D computer games such as first-person shooters and third-person platformers, without learning an advanced programming language.  It was written by Emmanuel Icart of Momor Productions with the Delphi programming language.  Games created with Ray Game Designer 2 can be distributed freely or sold for profit, without paying any royalties to Momor Productions.  RGD2 can use either OpenGL, Direct3D, or its own software engine for rendering 2D and 3D graphics.  Ray Game Designer 2 uses an extremely simple syntax for creating "behaviours", code used to create simple artificial intelligence in its games.  RGD2 comes in the French and English languages, but can be translated into virtually any language by editing a few text files.  Ray Game Designer 2 is also the successor of Ray Game Designer.  The software remains unfinished and hasn't been updated since early 2002.

Eugene Jarvis: Eugene Peyton Jarvis (born 1955) is an American game designer and programmer, known for producing pinball machines for Atari and video games for Williams Electronics.  Most notable amongst his works are the seminal arcade video games "Defender" and "" in the early 1980s, and the "Cruis'n" series of driving games for Midway Games in the 1990s.  He co-founded Vid Kidz in the early 1980s and currently leads his own development studio, Raw Thrills Inc. In 2008 Eugene Jarvis was named the first Game Designer in Residence by DePaul University's Game Development program.  His family owns the Jarvis Wines company in Napa, CA.

Aaron Allston: Aaron Dale Allston (December 8, 1960 – February 27, 2014) was an American game designer and author of many science fiction books, notably "Star Wars" novels.  His works as a game designer include game supplements for role-playing games, several of which served to establish the basis for products and subsequent development of TSR's "Dungeons & Dragons" game setting Mystara.  His later works as a novelist include those of the "" series: "Wraith Squadron", "Iron Fist", "Solo Command", "Starfighters of Adumar", and "Mercy Kill".  He wrote two entries in the "New Jedi Order" series: "" and "".  Allston wrote three of the nine Legacy of the Force novels: "Betrayal", "Exile", and "Fury", and three of the nine Fate of the Jedi novels: "Outcast", "Backlash", and "Conviction".

Richard Garfield: Richard Channing Garfield (born June 26, 1963) is an American game designer.  Garfield created "", which is considered to be the first modern collectible card game (CCG).  "Magic" debuted in 1993, and its success spawned many imitations.  Garfield oversaw the successful growth of "Magic" and followed it with other game designs.  Garfield also designed the living card game (LCG) "Netrunner", as well as "BattleTech", "" (originally known as "Jyhad"), "Star Wars Trading Card Game", the card game "The Great Dalmuti", and the board game "RoboRally".  He also created a variation of the card game Hearts called Complex Hearts.  Garfield first became passionate about games when he played the roleplaying game "Dungeons & Dragons", so he designed "Magic" decks to be customizable like roleplaying characters.  Garfield and "Magic "are in the Adventure Gaming Hall of Fame.

Matt James (game designer): Matt James (born 1981) is an American game designer and a decorated veteran of the United States Army.  As a game designer, James is best known for his online and print works for the "Dungeons & Dragons" fantasy role-playing game published by Wizards of the Coast, "Pathfinder" role-playing game by Paizo, and Privateer Press.  He has also designed game content for Wolfgang Baur's Kobold Press (formerly Open Design LLC).  In 2012 James won an ENnie Award for "" and has been nominated for several Origins Awards.  In 2014, James won an ENnie Award for "".

Supporting paragraphs: Ghostbusters (role-playing game) Sandy Petersen
Answer: Carl Sanford Joslyn "Sandy" Petersen