MITCHELL, William J. December 26, 2012, age 78 Professor of Engineering at the University of Michigan for 50 years. Beloved husband of Audrey "Laurie". Dear father of William L., Elizabeth (Kennieth) Mitchell-Mysinger, Stephen J., Thomas R., James C. and Sharon M. Loving grandfather of Nicole, Jessica and Erica Mysinger. Brother of Thomas, Robert, Janet Brown and the late David (Mary), Anthony and Albert Balsis and Charlotte (Bill) Nemeth. Funeral Mass 9:30 am Saturday at Divine Child Church, Dearborn. (Instate in church at 9 am). Visitation 3-9 pm Friday at the Dearborn Chapel of the Howe-Peterson Funeral Home, 22546 Michigan Ave. www.howepeterson.com