author
Known today mainly for the travel piece Op den Tarn, this elusive author left behind a vivid glimpse of the Tarn Valley and its dramatic scenery. Very little biographical information appears to be readily documented, which gives the work an added air of mystery.

by M. Mendell
M. Mendell is the credited author of Op den Tarn, a Dutch-language travel work that appeared in De Aarde en haar Volken in 1909 and is now preserved through Project Gutenberg and related archives.
Reliable biographical details about the person behind the name are scarce in the sources I could confirm. Because of that, it is safer to describe M. Mendell through the surviving work rather than make assumptions about nationality, full name, or broader career.
What does come through clearly is an eye for place. Op den Tarn presents the Tarn region through landscape, travel, and observation, suggesting a writer interested in making geography feel immediate and alive for readers.