卡尔目前是谢菲尔德大学的经济学教授。他在与卡迪夫大学联合监督的开放大学获得经济学博士学位。2001年至2005年,卡尔在莱斯特大学工作,最初是讲师,后来晋升为高级讲师。2005年9月,他被任命为谢菲尔德大学的读者群,随后于2009年1月晋升为个人主席。从2006年到2010年,卡尔是埃塞克斯大学社会和经济研究所(ISER)的外部副研究员。他曾在众多期刊上发表文章,包括:Economica;经济调查;教育经济学评论;银行和金融杂志;经济行为与组织杂志; Journal of Health Economics; Journal of Economic Psychology; Journal of the Royal Statistical Society; Labour Economics; Oxford Bulletin of Economics and Statistics; Oxford Economic Papers; and Review of Income and Wealth. He has also published policy related research in Fiscal Studies, Oxford Review of Economic Policy and The Lancet. Research interests include applied microeconometrics, household finances and labour economics. Karl was a member of the Grant Assessment Panel C of the Economic and Social Research Council (ESRC) from September 2016-2020. Currently Karl is an Associate Editor of the Bulletin of Economic Research.