The creators of 13th Age in Glorantha are the authors of 13th Age and Glorantha. No one could do this project better.

List of author credits

This is a natural partnership of some of the strongest role-playing game designers and authors in the industry. They share a long history, having gamed and worked together for over twenty years.

Before Rob Heinsoo was a co-designer for 13th Age and 4th Edition Dungeons & Dragons, Rob worked on Gloranthan projects with Greg Stafford at Chaosium and Issaries Inc. Rob also worked on the computer game King of Dragon Pass which borrowed ideas from Jeff Richard’s Gloranthan Varmandi campaign.

Jonathan Tweet, before co-designing 13th Age and being the lead designer for 3rd Edition Dungeons & Dragons Jonathan developed Gloranthan adventures for Avalon Hill/Chaosium.

In many ways, for them it is coming back full circle.

Let me introduce you to the creators

Rob Heinsoo

Rob Heinsoo Picture

Rob Heinsoo is the creative director for Fire Opal Media and the co-designer of 13th Age. Early in his career, he worked at Chaosium as Greg Stafford’s Gloranthan herald. Rob subsequently handled QA on the King of Dragon Pass computer/iOS Glorantha game and appears in that game as a uniquely trustworthy Eurmali trickster.

His several dozen game design credits include Epic Spell Wars, Three-Dragon Ante, Shadowrun: Crossfire, lead design of the 4th edition of D&D, the 13th Age Bestiary, and 13 True Ways.

Rob blogs at

Jeff Richard

Jeff Richard is the creative director for Moon Design Publications and editor-in-chief for all things Glorantha. Jeff is the lead author of the Guide to Glorantha, HeroQuest Glorantha, Pavis: Gateway to Adventure, Sartar: Kingdom of Heroes, and Sartar Companion. Jeff is the writer of the Prince of Sartar webcomic illustrated by Kalin Kadiev.

Jeff holds a Juris Doctor from the University of Washington School of Law and lives in Berlin, Germany.

Jeff Richard

Jonathan Tweet

Jonathan Tweet Picture

A member of the Adventure Gaming Hall of Fame, Jonathan Tweet is the other co-designer of 13th Age. His game credits include Magic: the Gathering, Ars Magica, Over the Edge, being the lead designer of the 3rd edition of D&D, and author on 13 True Ways. One of Jonathan’s Gloranthan adventures appears in Avalon Hill’s Strangers in Prax.

His most recent success is Grandmother Fish: a child’s first book of Evolution.

Greg Stafford

Greg Stafford is one of the most influential game designers of all time. The creator of the fantasy world of Glorantha and founder of the game company Chaosium, he helped design several role-playing game systems, including RuneQuest, Pendragon, and HeroQuest.

Greg lives in Northern California.

Face of Greg Stafford


ASH LAW Picture

ASH LAW was born in Britain, and has been alive ever since. ASH is the the lead writer for 13th Age Organized Play, was the author of a good third of the 13th Age Bestiary, and has ended up as the go-to-guy for a lot of 13th Age related stuff. ASH was also responsible for creating the Midgard Bestiary: 13th Age Compatible Edition and Deep Magic: 13th Age Compatible Edition, both from Kobold Press. ASH is currently developing Shards of Broken Sky, an adventure for 13th Age.

The Companies Behind the Creators

Behind the team are a trio of small gaming companies dedicated to providing high-quality gaming products. There is a lot to the work beyond the creating the books, from fulfillment, to web site design, to layout, art, and running games.

Fire Opal Media

Fire Opal Media Logo

Fire Opal Media is a game design and development company bringing together some of the very best designers and professionals in the gaming industry for a single purpose: to make great games. Fire Opal Media is responsible for developing such games as 13th Age, Shadowrun: Crossfire (an adventure deckbuilding game), and Heralds of Chaos.

You can find them at the Fire Opal Media website

Moon Design Publications

Moon Design Publications owns and publishes all things Gloranthan. They recently celebrated 15 years of publishing, and have been active in the Gloranthan community for even longer. They recently published their magnus opus, the Guide to Glorantha and accompanying Argan Argar Atlas.

You can learn more about Moon Design Publishing at

Moon Design Publications Logo

Pelgrane Press

Pelgrane Press Logo

Established in 2000, Pelgrane Press Ltd is a publisher of award-winning tabletop roleplaying games, including the 13th Age by Rob Heinsoo and Jonathan Tweet, Trail of Cthulhu by Kenneth Hite, The Dying Earth and Ashen Stars by Robin D Laws. Pelgrane Press is also the home of the webzine Page XX, The Birds comic, and music for RPGs by James Semple and fellow composers.

Visit Pelgrane Press online at

How can I be involved with 13th Age of Glorantha? ➜