Susan M. Hilbert, daughter of Paul C. and Jane A. Hilbert of Amherst and Ellicottville, was married to Peter J. Williams, son of Paul and Marylou Williams of Darien, Conn., at 6:30 p.m. Saturday in St. John Catholic Church, Darien. The Rev. Jude Fay and the bridegroom's cousin, Rev. Arthur Bowman, a Presbyterian minister, performed the ceremony before a reception was given in Country Club of Darien. The couple left for the Amalfi Coast of Italy and will live in Manhattan. A graduate of Mount St. Mary Academy and St. Bonaventure University, the bride is pursuing a doctorate in organizational psychology from Temple University and is an assistant vice president of Chase Manhattan Bank. The bridegroom, a graduate of University of Michigan and University of Pennsylvania School of Law, is employed by Fidelity Investments.