author
A Dutch writer tied to early 20th-century exploration literature, best known for a vivid account of New Guinea’s little-known interior. His surviving work points to a strong interest in geography, travel, and the human side of expedition history.

by J. W. Langeler, L. A. C. M. (Ludovicus Antonius Carel Maria) Doorman
J. W. Langeler is credited as the co-author of Nieuw-Guinee en de exploratie der "Meervlakte", a Dutch work about exploration in New Guinea that Project Gutenberg lists under his name. The book was written with L. A. C. M. Doorman and is associated with the years 1913–1915 in descriptions of the expedition material.
Available sources strongly suggest that J. W. Langeler was Jan Willem Langeler. A Wikidata entry for Jan Willem Langeler gives his dates as 1890 to 1945, but the online evidence visible here is limited, so it is safest to treat that identification as likely rather than fully confirmed.
What can be said with confidence is that Langeler is remembered today mainly through this exploration narrative. The work has remained accessible through public-domain and library listings, which has helped preserve his place in Dutch travel and exploration writing.