They had a falling out when O'Brien was 16 over civilian casualties during an attack on Iraq using a computer program that Walter had created for humanitarian purposes .
He was the one who brought Walter over from Ireland and then worked with him for several years .
They had a falling out when Walter was 16 over civilian casualties during an attack on Iraq using a computer program that Walter had created for humanitarian purposes .
He was the one who brought Walter over from Ireland and then worked with him for several years .