In 1991, Tolbert assumed the position of chair of Howard University's History department, holding the post until 1998, then again from 2002 to 2005, and 2009.
Tolbert assumed the position of chair of Howard University's History department. This was in 1991. Tolbert was holding the post until 1998, then again from 2002 to 2005, and 2009. This was in 1991.