David McCullough, National Book Festival

Author and historian David McCullough appears at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

David McCullough, National Book Festival

Author and historian David McCullough appears with wife Rosalee at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

Carla Hayden, National Book Festival

Librarian of Congress Carla Hayden delivers opening remarks at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. Carla Hayden was sworn in as the 14th Librarian of Congress on September 14, 2016. Hayden is the first woman and the first African American to lead the national library.

Carla Hayden, National Book Festival

Librarian of Congress Carla Hayden delivers opening remarks at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. Carla Hayden was sworn in as the 14th Librarian of Congress on September 14, 2016. Hayden is the first woman and the first African American to lead the national library.

David McCullough, National Book Festival, David Rubenstein

Author and historian David McCullough (left) appears with philanthropist David Rubenstein (center) and Susan K. Siegel (right), Library of Congress Director of Development (right) at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

Carla Hayden, National Book Festival

Librarian of Congress Carla Hayden delivers opening remarks at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. Carla Hayden was sworn in as the 14th Librarian of Congress on September 14, 2016. Hayden is the first woman and the first African American to lead the national library.

David McCullough, National Book Festival, David Rubenstein

Author and historian David McCullough (left) appears with philanthropist David Rubenstein (center) and Susan K. Siegel (right), Library of Congress Director of Development (right) at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

Carla Hayden, National Book Festival

Librarian of Congress Carla Hayden delivers opening remarks at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. Carla Hayden was sworn in as the 14th Librarian of Congress on September 14, 2016. Hayden is the first woman and the first African American to lead the national library.

Carla Hayden, National Book Festival

Librarian of Congress Carla Hayden delivers opening remarks at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. Carla Hayden was sworn in as the 14th Librarian of Congress on September 14, 2016. Hayden is the first woman and the first African American to lead the national library.

Carla Hayden, National Book Festival

Librarian of Congress Carla Hayden delivers opening remarks at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. Carla Hayden was sworn in as the 14th Librarian of Congress on September 14, 2016. Hayden is the first woman and the first African American to lead the national library.

Carla Hayden, National Book Festival

Librarian of Congress Carla Hayden delivers opening remarks at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. Carla Hayden was sworn in as the 14th Librarian of Congress on September 14, 2016. Hayden is the first woman and the first African American to lead the national library.

Carla Hayden, National Book Festival

Librarian of Congress Carla Hayden delivers opening remarks at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. Carla Hayden was sworn in as the 14th Librarian of Congress on September 14, 2016. Hayden is the first woman and the first African American to lead the national library.

Carla Hayden, National Book Festival

Librarian of Congress Carla Hayden delivers opening remarks at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. Carla Hayden was sworn in as the 14th Librarian of Congress on September 14, 2016. Hayden is the first woman and the first African American to lead the national library.

Carla Hayden, National Book Festival

Librarian of Congress Carla Hayden delivers opening remarks at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. Carla Hayden was sworn in as the 14th Librarian of Congress on September 14, 2016. Hayden is the first woman and the first African American to lead the national library.

Carla Hayden, National Book Festival

Librarian of Congress Carla Hayden delivers opening remarks at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. Carla Hayden was sworn in as the 14th Librarian of Congress on September 14, 2016. Hayden is the first woman and the first African American to lead the national library.

Carla Hayden, National Book Festival

Librarian of Congress Carla Hayden delivers opening remarks at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. Carla Hayden was sworn in as the 14th Librarian of Congress on September 14, 2016. Hayden is the first woman and the first African American to lead the national library.

Carla Hayden, National Book Festival

Librarian of Congress Carla Hayden delivers opening remarks at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. Carla Hayden was sworn in as the 14th Librarian of Congress on September 14, 2016. Hayden is the first woman and the first African American to lead the national library.

David McCullough, National Book Festival

Author and historian David McCullough appears at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

David McCullough, National Book Festival

Author and historian David McCullough appears at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

David McCullough, National Book Festival

Author and historian David McCullough appears at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

David McCullough, National Book Festival

Author and historian David McCullough appears at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

David McCullough, National Book Festival

Author and historian David McCullough appears at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

David McCullough, National Book Festival

Author and historian David McCullough appears at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

David McCullough, National Book Festival

Author and historian David McCullough appears at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

David McCullough, National Book Festival

Author and historian David McCullough appears at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

David McCullough, National Book Festival

Author and historian David McCullough appears at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

David McCullough, National Book Festival

Author and historian David McCullough appears at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

David McCullough, National Book Festival

Author and historian David McCullough appears at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

David McCullough, National Book Festival

Author and historian David McCullough appears at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)

David McCullough, National Book Festival

Author and historian David McCullough appears at the 17th annual Library of Congress National Book Festival at the Walter E. Washington Convention Center in Washington D.C. on Saturday, September 2, 2017. McCullough is a two-time winner of the Pulitzer Prize and the National Book Award and a recipient of the Presidential Medal of Freedom. His newest book is "The American Spirit: Who We Are and What We Stand For." (Photo by Jeff Malet)