Updated at 4:45 with comments from ZMD board member Gloria Wessels.
Updated with comments from Zoo-Museum District board member Jerome Glick, and to correct Archibald's tenure at the museum.
The president of the Missouri History Museum in Forest Park has resigned.
A spokesman for the museum confirmed that Robert Archibald submitted his resignation to the chair of the museum's Board of Trustees today. The spokesman, Everett Dietle, did not have any additional information. The board will meet Friday morning at the museum.