Fawkes. Idiot. Look him up.
answer nr.2: You find fawkes in Vault 87 when you go there (possibly when you're doing the Finding the garden of eden quest) he will be in the 05 testing cell in the testing labs, there you can talk to him via the intercom and agree to release him. He will tell you to go to the scientists room and activate the fire alarm. But if you have an Average science skill you should put that to use instead and free him by unlocking the door 'cause else the others also gets released (2 centaurs and a powerful guy called sid) Fawkes will then agree to retrive the GECK and then you will part. But when you escape Raven Rock later he will be outside and you can then get him as your companion if you have good karma.