By Michela Moscufo (Reuters) – Columbia University will add historical markers to four residence halls to acknowledge legacies of slavery and racism and to commemorate African American students, a university professor said on Tuesday. The markers, part of a university-wide project initiated by President Lee Bollinger after the murder of George Floyd in May 2020, include signs at residence halls John Jay Hall and 50 Haven Avenue, formerly Bard Hall, noting that slave owners John Jay and Samuel Bard had close ties to the university. A marker at Furnald Hall will tell the story of a morning in 19…