Critical points of random polynomials with independent identically distributed roots

Let $X_1,X_2,...$ be independent identically distributed random variables with values in $\C$. Denote by $μ$ the probability distribution of $X_1$. Consider a random polynomial $P_n(z)=(z-X_1)...(z-X_n)$. We prove a conjecture of Pemantle and Rivin [arXiv:1109.5975] that the empirical measure $μ_n:=\frac 1{n-1}\sum_{P_n'(z)=0} δ_z$ counting the complex zeros of the derivative $P_n'$ converges in probability to $μ$, as $n\to\infty$.

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