In Sneakers (1992) Robert Redford plays a sneaky bastard, Martin Bishop.
In Spy Game (2001) Redford plays a CIA handler running an agent named Tom Bishop, played by Brad Pitt.
So after the events of Sneakers, Martin Bishop used the crypto-cracking chip to fake a new identity, "Nathan Muir," even inventing a CIA background and Langley records going back decades. Later he reunites with the son he abandoned back in the 70s. So ok, it's a fanciful stretch.