U.S. award-winning photojournalist James Nachtwey, right, rides on the top of a U.S. Humvee during a patrol in central Baghdad in this April 17, 2003 photo.

A talk by war photographer James Nachtwey, which had been planned for Tuesday night, has been rescheduled for Wednesday night instead.

Nachtwey will present the keynote lecture for Kansas University’s Common Book Program at 7:30 p.m. Wednesday in Woodruff Auditorium in the Kansas Union, 1301 Jayhawk Blvd. The event is free and open to the public.

The lecture had to be pushed back due to travel delays, event organizers said.

Ernest Hemingway’s “A Farewell to Arms,” the 2015-2016 Common Book, chronicles the experience of an American ambulance driver during World War I. Nachtwey’s lecture, “The Unvanquished,” will discuss how Hemingway influenced him, as well as the parallels between the themes in his photographs and Hemingway’s novels.

Nachtwey, a contract photographer for Time magazine and a frequent contributor to National Geographic, shot the Sept. 11 terrorist attacks, the AIDS epidemic in Africa, wars in Afghanistan and Bosnia and the Syrian immigration crisis in Europe. He is a five-time recipient of the Overseas Press Club’s Robert Capa Gold Medal for war photographers, among other awards.