From 1986 to 2004 Cassam taught Philosophy at Oxford University, where he was a Fellow of Wadham College. In 1993 he was Visiting Associate Professor at the University of California, Berkeley. In 2004 he held the John Evans Distinguished Visiting Professorship in Moral and Intellectual Philosophy at Northwestern University, Illinois. He was Professor of Philosophy at University College London in 2005-2006 and Knightbridge Professor of Philosophy at Cambridge University in 2007-2008. Since 2009, Cassam has been a Professor of Philosophy at Warwick University. In 2016 he was awarded a Leadership Fellowship by the Arts and Humanities Research Council in the UK.