Robert began his media career in 1993 at Times Newspapers. In 1996, he joined LineOne, one of the first Internet services to launch in the UK, where he helped build its online advertising business. Robert joined Carat Interactive in 2000 as Managing Partner and was promoted to Managing Director in 2002. In 2004, Robert founded Diffiniti, which became one of the largest stand-alone online planning and buying companies in the UK. In 2009, Diffiniti became part of the iProspect network. Robert re-joined Carat as Managing Director in May 2009. In January 2011 he was appointed to the role of CEO for Aegis Media UK and in February 2013 was appointed CEO for Dentsu Aegis Network Northern Europe. Robert was appointed Chief Executive Officer of Dentsu Aegis Network, USA in January 2015 and became COO of Quantcast in 2018.