This book gives a brief treatment of the equivariant cohomology of the classical configuration space F dn from its beginnings to recent developments. This subject has been studied intensively starting with the classical papers of Artin 19251947 on the theory of braids and progressing through the work of Fox and Neuwirth 1962 Fadell and Neuwirth 1962 and Arnold 1969. The focus of this book is on the mod 2 equivariant cohomology algebras of F dn whose additive structure was described by Cohen 1976