His mother's family were English but Walker followed his father's family tradition in attending Trinity College Dublin. Walker's grandfather had been a fellow of Trinity and published classical texts as well as elementary mathematics and logic texts.
Kanyang ina ang pamilya ay English ngunit Walker sinundan ng kanyang ama sa pamilya na tradisyon, dumalo sa Trinity College Dublin. Walker's grandfather had been isang tao ng Trinity at nai-publish na klasiko teksto pati na rin ang elementarya matematika at lohika teksto.