Professor Peter Sarnak, the Eugene Higgins Professor of Mathematics and permanent member of the Institute of Advanced Study at Princeton, will deliver the lectures in the twelfth annual Baylor Lecture Series in Mathematics. Dr. Sarnak will visit Baylor on April 3-6, 2019. Dr. Sarnak was born in Johannesburg, South Africa. He graduated with his B.Sc. (Honors) in 1976. Subsequently, he earned his Ph.D., under the supervision of Paul Cohen, from Stanford in 1980. He has been a professor of mathematics at Princeton since 1991. His previous academic appointments include professorships at the Courant Institute of New York University and Stanford University. Professor Sarnak has made major contributions to analysis and number theory. His early work on the existence of cusp forms led to the disproof of a conjecture of Atle Selberg. He has obtained the strongest known bounds towards the Ramanujan-Petersson conjectures for sparse graphs. He was also one of the first to exploit the connections between certain questions of theoretical physics and analytic number theory. His work on subconvexity for Rankin-Selberg L-functions led to the resolution of Hilbert's eleventh problem. Professor Sarnak was elected to the National Academy of Sciences and Fellow of the Royal Society in 2002. He was awarded an honorary doctorate by the Hebrew University of Jerusalem (2010), the University of Witwatersrand (2014) and the University of Chicago (2015). In 2014, Dr. Sarnak was the recipient of the Wolf Prize in Mathematics. Additionally, Dr. Sarnak was awarded the Polya Prize from SIAM in 1998, the Ostrowski Prize in 2001, the Levi L. Conant Prize in 2003, the Frank Nelson Cole Prize in Number Theory in 2005, and a Lester R. Ford Award in 2012. Dr. Sarnak will deliver his public lecture, "Integral Quadratic Forms and Applications" on April 4 at 4:00 pm in MMSci 101. On April 5, he will give a colloquium talk, "Integer points on affine cubic surfaces", in MMSci 301 at 4:00 pm. Both lectures are suitable for a general audience. For further information on Professor Sarnak and his lectures/abstracts, please visit the Baylor Lecture Series in Mathematics web site.