Mr. Walker has served as a non-executive member of Tritium's board of directors since July 2022. From November 2017 to March 2022, Mr. Walker served as Executive Vice President and Chief Financial Officer of IHS Holding Limited (IHS), a public telecommunications infrastructure company. Prior to IHS, from January 2013 to November 2017, Mr. Walker served as Group Finance Director and as a member of the board of directors for GKN plc, a global aerospace and automobile component manufacturer. From January 2016 to December 2019, Mr. Walker served as a non-executive director of Kier Group plc, a public construction and infrastructure services company, where he also served as Chair of the Audit Committee of the board of directors and as a member of the Remuneration and Nomination committees of the board of directors. Mr. Walker received a B.A. degree from Newcastle University.