Senior Sonalee Ravi (left), a chemistry major in Arts & Sciences, visits with her former teacher, Sandra Mueller (center), and Leonard Green, Ph.D., professor of psychology in Arts & Sciences, during the 2009 Cornerstone Mentor Awards presentation April 19 in Holmes Lounge. Mueller, a chemistry teacher at John Burroughs School in Ladue, Mo., was on hand to accept the Cornerstone Outstanding Teacher Award. Each year, Cornerstone: The Center for Advanced Learning invites graduating seniors who have served as academic mentors to other students to nominate an elementary or secondary school teacher they believe has significantly contributed to their intellectual and personal development. Ravi chose Mueller because “she greatly helped my intellectual growth, not only improving my confidence and writing skills but also helping me to realize that, with hard work, I had the capabilities to master any task.”