A relatively recent trend was emerging around 1921: reviewers appending their names to their reviews.
It is only in this twentieth century that the newspapers of New York have chosen to declare the authorship of their reviews of books, of plays, of pictures and of music…. [But] even now, a certain proportion of the book reviewing, even in the best of our newspapers, is anonymous; and it is very properly so, the works of salient importance being dealt with by experts whose names are given, while the less significant volumes are briefly considered by a competent office staff.
In modern times, the largest outlets for book reviews don’t publish anonymously. Neither the New York Times, Wall Street Journal, Washington Post, nor New York Review of Books does so, at least not that I can find.
However, anonymous or pseudonymous reviews abound on websites like Amazon and Goodreads.
Book Reviews — Signed or Unsigned?
Published: Sunday, August 14, 1921