1870 – Born in New Haven, Connecticut.
1895 – Received his BA in Yale University where he also worked as the editor of both The Yale Courant and The Yale Literary Magazine.
1897 – Finished his Master’s Degree in Yale.
– Became editor of the New Haven Morning News.
1905 – After writing for The New York Evening Post and The New York Sun, BJH left newspapers and became a "muckraker" writing for McClure’s Magazine.
1906 – Appeared his writing "The Story of Life-Insurance".
1919 – Began writing biographies, when he was the ghostwriter of "Ambassador Morgenthau’s Story" for Henry Morgenthau, Sr.
1921 – Won the Pulitzer Prize for The Victory at Sea which he co-authored with William Sowden Sims.
– Wrote the Age of Big Business using a series of individual biographies, as an enthusiastic look at the foundation of the corporation in America and the rapid rise of the United States as a world power.
1923 – Pulitzer Prize for The Life and Letters of Walter H. Page.
1929 – Winner of the Pulitzer Prize for The Training of An American.
1940-1946 – Explained his work on a biography on Andrew Mellon, which was commissioned by the Mellon
family, but never published.