Mansell was born on 3 January 1952 in
Vancouver, Canada. She obtained her first masters at the LSE before taking a second and earning her doctorate at
Simon Fraser University. She has been involved in running the LSE serving as the academic Governor from 2005 until 2010 and she became the Head of the Media and Communications Department in 2006 and served until 2009. She was interim Deputy Director in and the Provost from 2015 to 2016. She joined the
International Association for Media and Communication and rose to be its President from 2004 to 2008. After that she continued to be an active member of several of its committees. IAMCR honoured her with a Distinguished Contribution Award at their annual conference in 2017 in recognition of being an "IAMCR catalyst". Mansell has been involved in the changes required to cope with new media including the changes in the law and international communication. She has noted however that new communication systems "..have not supplanted older means of communication" including free speech in public spaces. In 2022, she was elected a
Fellow of the British Academy (FBA), the United Kingdom's national academy for the humanities and social sciences. == Works include==