Walker worked at executive positions with firms in the securities and investment banking fields in Vancouver, British Columbia; Cottonwood Heights, Utah; Concord, California; Dunwoody, Georgia; and Kenilworth, Illinois.

He worked for American Express, Citibank, and Barclay's Bank and was a member of the board of directors of the Beneficial Financial Group.

In April 2002, while serving as president of the Sandy Utah Cottonwood Creek Stake, Walker became a member of the Second Quorum of the Seventy.

While serving as Executive Director of the Temple Department, in July 2012, Walker was interviewed by Barbara Walters as part of a 20/20 special series on heaven.

[5] Walker was succeeded as Temple Department Executive Director by Kent F. Richards, a member of the Second Quorum of the Seventy.