The director of the Smithsonian’s National Museum of American History says he will step down next month after nine years of leading the museum. He will part ways July 10 but will continue as a Smithsonian adviser through the end of the year. Glass became director in 2002 and oversaw the museum’s most extensive renovation and the conservation of the Star-Spangled Banner flag. Attendance has increased to more than 4 million visitors last year.
