The Archdiocese of Galveston-Houston has a biography of Walker, who was still in his 20s, on its website:

Fr. Kenneth Walker, FSSP was born in Upstate New York near Poughkeepsie, the middle of 11 children (6 boys and 5 girls). His family moved frequently when he was young. While his father was working construction in Wilmington, N.C, the family decided to build, with their own hands, a log cabin on some land they owned in nearby Tennessee. Their intention was to sell the home, but they changed their minds and moved in. While living there, they visited a used book store and found a book called The Incredible Catholic Mass. It described the Tridentine Mass, which they had never seen nor heard. The book was considered worthless and the storeowner gave it to them for free.

The family was intrigued. The more they learned about the Traditional Mass, the more they wanted it in their daily lives. On his own initiative, Fr. Walker began learning Latin. The family decided to sell their log cabin and move to rural Pennsylvania near Scranton where the Traditional Mass was offered. Fr. Walker eventually became an altar server at the FSSP Apostolate, and after attending Our Lady, Seat of Wisdom Academy in Ontario, entered the seminary.

He was ordained to the Sacred Priesthood in 2012, and currently serves as Assistant Pastor of Mater Misericordiae Mission, the FSSP Apostolate in Phoenix.