[2] He studied the early history of the United States specifically, writing mainly on the Continental Congress.
He was elected recording secretary of the Society upon its founding and served in that position for two terms for a total of seventeen years.
He wrote a number of articles for the Society's Publications of the American Jewish Historical Society, mainly focused on 18th-century trends and events across the American continent and the British West Indies as well as the development and spread of religious liberty in the New World.
[5] Friedenwald became secretary of the American Jewish Committee when it was founded in 1906, serving in that position for the next seven years.
When the Committee worked to abrogate the Russo-American Treaty of 1832, he did research for the Committee before congressional investigations, helped organize reports, and helped lead a nationwide correspondence campaign to end the treaty.