Dianne Prost O'Leary is a distinguished university professor, emerita, at the University of Maryland, who held appointments in the university's Computer Science Department, Institute for Advanced Computer Studies (UMIACS), and Applied Mathematics & Statistics and Scientific Compution Program (AMSC). She earned a BS from Purdue University and a PhD from Stanford University. Her research is in computational linear algebra and optimization, with applications including solution of ill-posed problems, image deblurring, information retrieval, and quantum computing. She has authored over 100 research publications on numerical analysis and computational science and 30 publications on education and mentoring. She is a member of the Association for Women in Mathematics (AWM) and a fellow of the Society for Industrial and Applied Mathematics (SIAM) and the Association for Computing Machinery (ACM). She was awarded a Doctor of Mathematics degree, honoris causa, from the University of Waterloo in 2005 and was chosen to be the 2008 AWM-SIAM Sonia Kovalevsky Lecturer.