Museum officials say Ron Tyler will retire on April 1.
Tyler on Tuesday night told the Fort Worth Star-Telegram that he has several research projects pending. Tyler says he plans to write a book about Texas cities during the 19th century.
The board and museum management will work to find a replacement for Tyler, who first began working at the museum in 1969 as curator of history. He left in 1986 to join the faculty of the University of Texas at Austin, where he served as professor of history.
Tyler rejoined the Amon Carter Museum, as director, in mid-2006.