Talking about the "literary immortality" of being remembered for decades and centuries past his or her death.

Feel free to qualify with "weak" immortality for remembrance within the field (simplest and most crowded) and "strong" immortality for becoming a household name known/remembered even outside the field.

A few names are obvious for "weak" immortals: Rear Admiral Grace Hopper, John McCarthy, Donald Knuth or Alan Kay probably won't be forgotten any time soon by CS and developers.

Alan Turing will probably be "strongly" immortal, although I am not sure computer science can claim him over mathematics and logic.

Who are your picks for immortality?