The phrase "author maintained" is correct and usable in written English.
It can be used when referring to a position or claim that the author has consistently upheld or defended in their work.
Example: "In the article, the author maintained that climate change is primarily driven by human activity."
Alternatives: "the author asserted" or "the author claimed".
However, while researching his novels, the author maintained throughout his career a steady output of shorter pieces, and the best of these are collected in "The Merry Heart".
However, the author maintained that the scene was justified in the context of the story, saying: "It's traumatic, but then I explore the consequences.
The author maintained that fly-fishing was unknown a hundred years ago, and I would like to remind you of the fact that the great Walton was a fly-fisherman, and a good one.
Speaking in London last night, the author maintained that the British printers had mistakenly published a previous draft of his text rather than the final version, and he urged fans not to read the novel until the correct version is released on Monday.
The author maintained that fly-fishing was unknown a hundred… "In your edition of May 14th, you carried a very clever & interesting story of my activities, episodes, & adventures as a humanitarium devoting her… Anent your "Notes and Comment," Jan . 29 , 1938
Therefore, the author maintained the implant, which was ultimately esthetically acceptable to the patient.
The young author "maintains a teasing affection for the absurdities of adolescence," Jennifer Egan wrote here last year.
"It hasn't even been agreed whether the author maintains the site or the publisher does".
Poetry, the author maintains, is central to any coherent vision of life.
While a triumph for capitalist production, it has been a failure for civil society and economic equality, the author maintains.
He spent much of his life "trying to construct languages that did not yet exist," the author maintains.
