author
1886–1942
An American engineer, explorer, and eyewitness whose writing helped expose the brutal abuses of the Putumayo rubber trade. Best known for The Putumayo, the Devil’s Paradise, he turned firsthand experience into a powerful work of protest and documentation.

by W. E. (Walter Ernest) Hardenburg
Born in 1886 and dying in 1942, Walter Ernest Hardenburg was an American engineer and explorer who became known for reporting on atrocities in the Putumayo region of the Amazon during the rubber boom. Reference pages for his work identify him as a United States engineer, and surviving bibliographic records connect him most strongly with his account The Putumayo, the Devil’s Paradise.
Hardenburg’s importance as a writer comes from the fact that he was not simply retelling rumors. Biographical records note that he traveled through the Putumayo in 1907–08, was himself robbed by agents tied to the rubber interests there, and later gave sworn testimony about abuses committed against Indigenous people. His book grew out of those experiences and other eyewitness evidence, giving it the force of both travel narrative and human-rights exposé.
He also wrote on practical technical subjects later in life, including a book on mosquito eradication, which hints at the engineering and public-health side of his career. Even so, he is remembered above all for preserving a witness account of one of the darkest chapters of the Amazon rubber era.