WILLIAMSTOWN, Mass. — Williams College in Massachusetts has tapped the Ivy League for its new president.The Williamstown school on Tuesday named Maud S. Mandel, dean of the college and professor of history and Judaic studies at Brown University, its 18th president.She takes over from interim President Protik Majumder, who was named to the post following the resignation in June of Adam Falk to become president of the Alfred P.