Harriet M. O'Brien,Ph.D.; dearest daughter of the late William D. and Mildred nee Ferguson; beloved sister of the late William H. (Patricia) and Patricia O'Brien; fond aunt of Catherine (Michael) McCuish, Mary Alice (Hart) Mecke and William (Stacey) O'Brien; great-aunt of Sarah, Michael, McCalla and Courtney; great family friend and "aunt" to Patricia (Raymond) and Jimmy Kryger. Harriet's achievements included graduating from the University of Chicago with her degree of Doctor of Philosophy, a lifelong Physics teacher with the Chicago Public School System and continued her love of learning at Northwestern University. Funeral Saturday, 9:15 a.m. from Kolbus-John V. May Funeral Home 6857 W. Higgins Ave., Chicago to Mary Seat of Wisdom Church for Mass of Christian Burial 10:00 a.m. Interment All Saints Cemetery. Visitation Friday 4 to 9 p.m. In lieu of flowers, donation to Rainbow Hospice, The Ark, 444 N. Northwest Highway, Suite 145, Park Ridge, IL 60068 would be appreciated. For information 773-774-3232