author
b. 1875
A journalist and historian of New York news life, he is best known for writing a detailed chronicle of The Sun and the people who shaped it. His work offers a vivid window into American newspaper culture in the late 19th and early 20th centuries.
Frank Michael O'Brien was an American writer born in 1875. The clearest confirmed detail available here is his authorship of The Story of the Sun: New York, 1833–1918, a substantial history of the New York newspaper The Sun published in 1918.
That book focuses on the paper's development from its founding through 1918 and centers on the newsroom, its editors, and its place in New York life. Because of that, O'Brien stands out less as a novelist than as a careful chronicler of journalism and newspaper history.
Reliable biographical details beyond his birth year are limited in the sources I could confirm, so this overview keeps to what is well supported. Even so, his surviving work suggests a writer deeply interested in how newspapers were made and how they helped shape public life.