Jeff McMahan, professor of moral philosophy at Oxford and co-founder of the Journal of Controversial Ideas, a new academic periodical in which contributors will be given the option of publishing their papers pseudonymously, talks to Quillette's Toby Young. They discuss why the journal is needed, how 'controversial' ideas will be defined and Professor McMahan responds to some of the criticisms that have greeted the idea, both from the Social Justice Left and the liberal centre.