Susan Stessin-Cohn will talk about her newest research and the second edition of the publication, "In Defiance: Runaways from Slavery in New York’s Hudson River Valley 1735-1831." Most enslaved persons held in the Hudson River Valley lived and worked and died and left behind no historical record—no birth certificates, no marriage records, no death certificates, unmarked graves. But "In Defiance" rescues over 900 of those individuals from obscurity because they decided to free themselves.