The 2017 Littlewood Lectures will be delivered by Professor Robert Vaughan, FRS. Prof. Vaughan is a distinguished analytic number theorist who has played a pivotal role in popularising the Hardy-Littlewood (circle) method as an indispensable tool both in higher dimensional Diophantine geometry, and in diverse applications spanning number theory. His book on the subject, first published in 1981, and revised in 1997, is required reading for any student of the subject, and was instrumental in the area's current renaissance. He has received numerous honours: he was an invited speaker at the 1978 ICM in Helsinki, was awarded the Berwick Prize of the London Mathematical Society in 1979, and was elected a Fellow of the Royal Society in 1990. Professor Vaughan has published over 120 papers, many of them landmarks in analytic number theory.