What is the author's style in The Greater Journey: Americans in Paris by David McCullough?

Author David McCullough has written The Greater Journey - Americans in Paris with a reverence and respect that resonates in the laudable descriptions of the many talented American artists and professionals who traveled to Paris to learn and develop their skills in the City of Lights. The admiration that the author has for the city and for these individuals is obvious. He opines that their contribution to their country by virtue of their Parisian experience actually changed American history. He proudly writes of them as pioneers and that "not all pioneers went west."