In October 1831 , he wrote to Herring .
The two men agreed to work together on The American Portrait Gallery ( later called the National Portrait Gallery of Distinguished Americans ) , published in four volumes between 1834 and 1839 .
In October 1831 , he wrote to Herring , and the two men agreed to work together on The American Portrait Gallery ( later called the National Portrait Gallery of Distinguished Americans ) , published in four volumes between 1834 and 1839 .