NAME: Ken Ono ADDRESS: Dept. Math. Penn State E-MAIL: ono@math.psu.edu TITLE: Ramanujan's Congruences for the partition function and some questions of Serre on the Fourier coefficients of modular forms ABSTRACT OF TALK: In this talk I will describe some recent work regarding the behavior of coefficients of modular forms. In particular, I will describe new results on the distribution of the partition function modulo primes $M>3$, and I will announce solutions to some longstanding questions of Serre on the paucity of zero coefficients for generic modular forms.