The comedian-activist was appointed to the National Sept. 11 Memorial & Museum board of directors Thursday afternoon. Stewart thanked the board and its chairman, Mayor Michael Bloomberg, and said he would do what’s needed to help.

The host of the Emmy-winning “The Daily Show” on Comedy Central recently used his show to champion a federal bill that provided billions to treat workers who became ill from exposure to toxic World Trade Center dust.

Foundation president Joe Daniels says Stewart is an important public figure and a regular New Yorker who saw the world change on 9/11.