Brian James Costello (born December 28, 1966) is an American historian, author, archivist and humanitarian.
He has served as president of Le Cercle Historique, a historical preservation and archival organization, since its founding in 1992.
[7] In 2009, Costello was named founding historian and archivist of the Historic Materials Collection of the Pointe Coupee Parish Library in New Roads, Louisiana.
He is often featured as a consultant and documentary participant in the fields of American and European genealogy, history, culture, linguistics, antiquities and spirituality with local, national and global audiences.
[8][9] In recognition of his cultural and spiritual works, Costello was knighted by the Military and Hospitaller Order of Saint Lazarus of Jerusalem.