[6][1][2] After undertaking the post-graduate training scheme he joined HM Treasury, and then held positions in the Department of Trade and Industry.

Holding a series of finance, investment and training positions over the following decade, as Senior Director in 1999 he became a key in the setting-up and early operations of the Welsh Assembly Government.

[1][2][7] After failing to replace Sir Jon Shortridge as permanent secretary,[6] in 2008 Jones left the civil service to join the governing board of Cardiff University as Director of Business and Strategic Partnerships with an honorary Professorship,[2][8] tasked to commercialise the college's research and engage with business.

[1] In September 2012, Jones was announced as the new Permanent Secretary to the Welsh Assembly Government,[1][2] replacing the retiring Dame Gillian Morgan.

[12] After leaving the civil service in 2017 Jones become an Independent Adviser and Honorary Fellow at Cardiff University,[13] Vice-President of Cardiff Business Club and has taken board positions at the Prince's Trust in Wales,[3] Keolis UK[5] and IQE.