Stephen Nissenbaum (A.B. Harvard College, 1961; M.A. Columbia University, 1963; Ph.D., University of Wisconsin–Madison, 1968 ), is Professor Emeritus of the University of Massachusetts at Amherst's History Department specializing in early American history through to the nineteenth century. Most notably, he co-authored a book with Paul Boyer in 1974 about the Salem witch trials, Salem Possessed: The Social Origins of Witchcraft, called "a landmark in early American studies" by John Putnam Demos.