Marius joined the project in fall 2025, after having been the academic director of the Center for Ethics and Philosophy in Practice  at LMU Munich since 2021. In his dissertation and a number of subsequent articles, he has developed and defended the idea of moral underdetermination. HIs work at that time was mainly at the intersection of normative ethics, metaethics, and the philosophy of science. During his time with the liberalism rekindled project, he will be working on a new project that focuses on the role of merit and desert in the liberal democratic framework. Pace the majority view in contemporary (liberal) philosophy, he argues that the notions of merit and desert provide distinct normative resources in support of the justification of liberal democracies.