William Siegmann was the leading expert on the arts in Liberia and Sierra Leone. His collection contains an exhaustive lists of resources, both primary and secondary, pertaining to the arts, culture, language, and history of Liberia and Sierra Leone. Also included are materials from his various projects, espeically those from his "Aesthetics of Power: African Art Along the Windward Coast." Correspondence with various museums and universities, personal and teaching materials are also in this collection.