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In 1990, Walden began his retail career as Chief Operating Officer of Peapod. In 1999, he joined Best Buy as the President of its internet and direct channels division. He then became Executive Vice President of Human Capital and Leadership and ended his time at Best Buy as the Executive Vice President of its Customer Business Group.
After Best Buy, Walden moved to Sears as the Chief Customer Officer and Executive Vice President. Afterward, he served as the President and CEO of Inversion Inc. and as Chief Executive of Activeion Cleaning Solutions.
He became Managing Director of Argos on 1 February 2012. He became Chief Executive of the Home Retail Group on 14 March 2014. In 2016, it was announced that Walden would be stepping down from CEO of Home Retail Group once Sainsbury's acquired Home Retail Group.
He is married, has five sons, and lives in London.