author
1883–1955
Best remembered for a practical early-20th-century guide to clear nonfiction prose, this American teacher wrote with a steady focus on explanation, structure, and useful advice for students. His work still feels surprisingly direct and readable today.

by Mervin James Curl
Mervin James Curl was an American writer and teacher best known for Expository Writing, a rhetoric handbook first published in 1919. The book presents him as a former instructor in English at the University of Illinois, and it was published by Houghton Mifflin in Boston, New York, and Chicago.
The front matter of Expository Writing suggests a life closely connected to teaching. Curl dedicated the book to students in Rhetoric III at the University of Illinois and thanked a number of faculty colleagues for their help, which gives a sense of him as a classroom-minded author interested in making writing clearer and more teachable.
Reliable biographical details beyond those basics are scarce in the sources I found. Genealogy-style records associated with his name indicate that he was born in 1883 and died in 1955, and a memorial for his wife Grace Voris Brown Curl states that they married in 1919 and that he died in 1955. I couldn't confirm a suitable verified portrait from the sources available, so no profile image is included.