Answer
Valery Legasov, portrayed by Jared Harris in the miniseries "Chernobyl," was a Soviet nuclear physicist and chemist who played a pivotal role in the aftermath of the Chernobyl disaster. As a member of the government commission tasked with investigating the accident, Legasov's scientific expertise and unwavering commitment to uncovering the truth were crucial in understanding the causes and consequences of the catastrophe.