Lonnie G. Bunch III, the first Black secretary of the Smithsonian Institution and one of the most influential museum leaders in the United States, announced Tuesday that he will step down at the end o...

After a seven-year run, Lonnie Bunch announced today that he was stepping down as secretary of the Smithsonian.

“He has experienced a mounting pressure campaign as the Smithsonian became a battlefield in the culture wars,” said Samuel J. Redman, a history professor at the University of Massachusetts Amherst who...