At what school did the man who was the great grandson of one president and the grandson of another president become a history professor in the 1870's?

The correct answer is Henry Adams was a professor of medieval history at Harvard University.

Explanation:

In the year 1870, Henry Adams was called to serve and make a difference in the world by being a professor at Harvard University. His purpose as an academic historian was to conduct several seminars across the United States and in Germany (University of Berlin).

Henry Brooks Adams (February 16, 1838 - March 27, 1918) was an American historian and member of the Adams political family, being descended from two U. S. Presidents.

As a young Harvard graduate, he was secretary to his father, Charles Francis Adams, Abraham Lincoln's ambassador in London. The posting had much influence on the younger man, both through experience of wartime diplomacy and absorption in English culture, especially the works of John Stuart Mill. After the American Civil War, he became a noted political journalist who entertained America's foremost intellectuals at his homes in Washington and Boston.

In his lifetime, he was best known for his History of the United States During the Administrations of Thomas Jefferson and James Madison, a nine-volume work, praised for its literary style.

His posthumously published memoirs, The Education of Henry Adams, won the Pulitzer Prize and went on to be named by the Modern Library as the best English-language nonfiction book of the 20th century.[1]