Designer Index

Last updated: January 17, 2026

This index profiles 47 key figures who shaped Sierra On-Line and its affiliated studios. Organized by primary role, many individuals contributed across multiple disciplines throughout their careers.

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Founders & Leadership

The visionaries who built Sierra from a kitchen table operation into a gaming empire.

Name	Notable Work	Era
Ken Williams	Co-founder, CEO, Mystery House	1979–1999
Roberta Williams	Co-founder, King’s Quest, Phantasmagoria	1979–1999
Bill Davis	Creative Director, introduced Hollywood techniques	1989–1996

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Adventure Game Designers

The storytellers behind Sierra’s legendary adventure franchises.

Flagship Series Creators

Name	Primary Series	Notable Games
Al Lowe	Leisure Suit Larry	LSL 1-7, Torin’s Passage
Corey Cole	Quest for Glory	QFG I-V (with Lori)
Lori Ann Cole	Quest for Glory	QFG I-V (with Corey)
Jane Jensen	Gabriel Knight	GK 1-3, Gray Matter
Mark Crowe	Space Quest	SQ I-IV (Two Guys)
Scott Murphy	Space Quest	SQ I-VI (Two Guys)
Jim Walls	Police Quest	PQ 1-3, Blue Force
Daryl Gates	Police Quest/SWAT	PQ: Open Season, SWAT 1-2

Writers & Designers

Name	Notable Work
Christy Marx	Conquests of Camelot, Conquests of the Longbow
Josh Mandel	Freddy Pharkas, Callahan’s Crosstime Saloon
Lorelei Shannon	King’s Quest VII, Phantasmagoria 2
Tammy Dargan	King’s Quest VII, Torin’s Passage
Scott Youngblood	Quest for Glory III-IV
Gano Haine	Pepper’s Adventures in Time, Mixed-Up Fairy Tales

RPG Designers

Name	Notable Work
Neal Hallford	Betrayal at Krondor (story), Return to Krondor
John Cutter	Betrayal at Krondor (systems), Betrayal in Antara

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Strategy & Simulation Designers

Architects of Sierra’s expansion beyond adventure games.

Dynamix

Name	Notable Work
Damon Slye	Red Baron, Aces of the Pacific, A-10 Tank Killer
Jeff Tunnell	The Incredible Machine, Trophy Bass
Richard Tunnell	Incredible Machine 2, 3-D Ultra Pinball
Randy Dersham	Front Page Sports Football
Allen Mcpheeters	Front Page Sports series
Brian Hahn	3-D Ultra series

Impressions Games

Name	Notable Work
Chris Beatrice	Caesar III, Pharaoh, Zeus
Simon Bradbury	Lords of the Realm I-II

Papyrus Design Group

Name	Notable Work
Dave Kaemmer	NASCAR Racing, IndyCar Racing
David Lester	NASCAR Racing series
David Selle	NASCAR Racing series
Kevin Ryan	Grand Prix Legends

Other Studios

Name	Studio	Notable Work
Warren Schwader	Sierra	Front Page Sports, Trophy Bass
Patrick Cook	Sierra	Outpost, SWAT series
Doug Johnson	Sierra	Various
Chuck Benton	Dynamix	Various

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Coktel Vision

The French studio that brought a unique European sensibility to Sierra’s catalog.

Name	Notable Work
Muriel Tramis	Gobliiins series, Lost in Time
Pierre Gilhodes	Inca, Inca II
Hibiki Godai	Additional credits

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Composers & Music Directors

The sonic architects who made Sierra games unforgettable.

Name	Notable Work	Achievements
Mark Seibert	Music Director 1987–2001	159 credits, “Girl in the Tower”
Ken Allen	Space Quest IV, King’s Quest V	Theme compared to John Williams
Robert Holmes	Gabriel Knight trilogy	Jane Jensen collaborator

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Art Directors & Artists

Visual artists who defined Sierra’s aesthetic identity.

Name	Notable Work
Andy Hoyos	King’s Quest V, VII, Phantasmagoria series
Peter Ledger	Conquests of Camelot (Christy Marx’s husband)

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Engine Developers & System Programmers

The technical pioneers who built the foundations of Sierra’s games.

Name	Achievement
Jeff Stephenson	Created SCI engine, “99% Jeff Stephenson’s invention”
Bob Heitman	Co-developed AGI and SCI engines

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Producers

The project leaders who brought games from concept to completion.

Name	Notable Work
Guruka Singh Khalsa	Sierra’s first producer, King’s Quest V, Codename: ICEMAN
Stuart Moulder	First CD-ROM title, Dr. Brain series

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Statistics

Category	Count
Total Profiles	47
Adventure Designers	14
RPG Designers	2
Strategy/Simulation	14
Composers	3
Engine Developers	2
Art Directors	2
Producers	2
Leadership	3
Coktel Vision	3

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See also: Developers • Publishers