Horton took up the role of associate director (improvement, insight and analysis) shortly before Christmas.
From 2011 to 2015, Horton was health policy adviser to Ed Miliband and head of public services at the Labour Party, where he led the independent Taskforce on Mental Health in Society.
Before this, he was research director at the Fabian Society, where he published research on several areas of social and economic policy, including his 2009 book on the future of the welfare state, The Solidarity Society.
In 2005 he was a special adviser at the Department of Trade and Industry and was previously a civil servant at HM Treasury covering science and innovation policy.
The Health Foundation works towards providing better healthcare for people in the UK. According to its website it spends around £30m and has three key work streams: to improve health service delivery, to make health policymaking more effective and to create a healthier UK population.