The movie "A Beautiful Mind" 2001

At Princeton University, John Nash struggles to make a meaningful contribution that will serve as his legacy to the world of mathematics. He makes a breakthrough discovery that will eventually earn him the Nobel Prize. After graduating, he turns to teaching and becomes romantically involved with his student Alicia. Meanwhile, the government asks for his help breaking Soviet codes, which soon draws him into a terrifying conspiracy. Nash grows increasingly paranoid until a discovery turns his entire world upside down. Now, only with Alicia's help will he be able to recover his mental strength and regain his standing as the great mathematician we know today.