Short answers, pulled from the story.
In 2009, HBO turned to the Language Creation Society, an organization Peterson had co-founded in 2007, to create the Dothraki language for Game of Thrones. The society held a contest, and Peterson won.
For Dune and Dune: Part Two, Peterson created Chakobsa, the language of the Fremen, along with its own abugida called Dinlih and a corresponding sign language. He also created Sardaukar, used only for meaningless chants, and a sign language for House Atreides.
The Language Creation Society is an organization Peterson co-founded in 2007 with nine other language creators. He served as its president from 2011 to 2014.
Peterson published a book called The Art of Language Invention in 2015. He also produced a YouTube video series under the same title and served as executive producer on the 2017 documentary film Conlanging: The Art of Crafting Tongues.
David J. Peterson created a free High Valyrian course on the Duolingo website and app in 2019. He expanded the course in conjunction with the House of the Dragon series premiere in August 2022.
Peterson received bachelor's degrees in English and linguistics from the University of California, Berkeley, where he studied from 1999 to 2003. He then earned a master's degree in linguistics from the University of California, San Diego, completing it in 2006.