A conlanger /ˈkɒnlæŋər/ is a person who invents conlangs (constructed languages).
Individuals who have been hired to create languages.
Victoria Fromkin - Paku (a.k.a. Pakuni)
Paul Frommer - Na'vi, Barsoomian
Marc Okrand - Klingon, Vulcan, Atlantean
Matt Pearson - Thhtmaa
David J. Peterson - Dothraki, Valyrian, Kastithanu, L'Irathi, Indojisnen, Sondiv, Shiväisith, Lishepus, Trigedasleng, Noalath, Inha, Munja'kin
Wolf Wikeley - Tho Fan
"Auxlangers" are conlangers who have created languages intended for international communication.
Louis de Beaufront
Léon Bollack
James Cooke Brown
Louis Couturat
Alexander Gode
Ján Herkeľ
Lancelot Hogben
Otto Jespersen
Juraj Križanić
Matija Majar
Vojtěch Merunka
Jackson Moore
Charles Kay Ogden
Giuseppe Peano
Kenneth L. Pike
Waldemar Rosenberger
Johann Martin Schleyer
Kenneth Searight
Jan van Steenbergen
Edgar de Wahl
L. L. Zamenhof
Conlangers whose work has been published in books or other media that they created:
Richard Adams: Lapine, in Watership Down
Hector Berlioz
Anthony Burgess: Nadsat in A Clockwork Orange & a prehistoric language in Quest for Fire.
Samuel R. Delany
Suzette Doctolero: Enchanta from the Encantadia Saga.
Diane Duane
Suzette Haden Elgin: Láadan, in the Native Tongue series
Václav Havel
Frank Herbert
M.A.R. Barker: Tsolyáni for Tékumel
Hergé
Ursula K. Le Guin
Barry B. Longyear
Morioka Hiroyuki
George Orwell: Newspeak, in Nineteen Eighty-Four
Lynne Sharon Schwartz: in The Writing on the Wall
J. R. R. Tolkien: more than twenty languages including Quenya, Sindarin, Khuzdul; see Languages constructed by J. R. R. Tolkien
Karen Traviss: Mando'a in the Star Wars expanded universe
Christian Vander
Tad Williams: Higher Singing in Tailchaser's Song
Marion Zimmer Bradley
Robert Jordan: The Old Tongue in The Wheel of Time
Christopher Paolini: The Ancient Language in the Inheritance Cycle (Eragon and its sequels)
