Martin is an avid believer in making the market for charitable giving more efficient by measuring charity impact and ensuring that money flows to the charities that use it best. He argues that scrutiny, analysis and assessment of charities are not just desirable – they are essential.

Martin was Chief Executive of New Philanthropy Capital from April 2008 to July 2011, having previously held the position of Director of Research. In 2009, Martin co-founded a new charity, Pro Bono Economics, which pairs charities with economists. Prior to joining NPC, Martin was a senior economist at Goldman Sachs International from 1994 to 2001 and, before that, an economist at the Bank of England.