Mathematics is an intellectual practice in which humans act in various ways. Human action invites ethical reflection, but the ethics of mathematical knowledge-making has thus far attracted little attention from philosophers of mathematics. The VaViM project employs virtue theory to study injustices in the production of mathematical knowledge. The project is interventionist in that it seeks to provide concrete recommendations for improvement, such as policy advice. VaViM employs case studies to shed more light on how virtues (e.g. charity) and vices (e.g. egotism) manifest in mathematical knowledge-making. This will reveal points of interaction between the ethics and epistemology of mathematical practices. In doing so VaViM will open up a discursive field for philosophers and mathematicians to engage with the ethics of mathematics.