sentences:  Glass was executive director of the North Carolina Humanities Council from 1983 to 1987.From 1987-2002, Glass served as executive director of the Pennsylvania Historical and Museum Commission, managing the largest and most comprehensive state history program in the country, with 25 historical sites and museums, including the State Archives and State Museum; the State Historic Preservation Office, public history programs, and historical publications.Beginning 2002, he was named the director of the National Museum of American History.