Abstract
BACKGROUND: Concern is growing over the power, influence, and threats to health and equity from the operations of large global consultancy firms. Collectively, these firms support a neoliberal policy environment promoting business interests ahead of public health. Global consultancy firms act as commercial determinants of health, an evolving area of research over recent years. However, this research mainly focuses on specific corporations or industry sectors, especially those which produce harmful products, including ultra-processed food, alcohol, and fossil fuels. It is therefore important to expand the focus to include large global consultancy firms and place a public health and equity lens over their operations. MAIN BODY: Global consultancy firms have wide-ranging conflicts of interest. These arise from the 'revolving door' employment strategies between their own staff and those from government and regulatory bodies. These firms also advise governments on taxation and other matters while concurrently advising corporate clients on ways to minimise taxation. They advise fossil fuel corporations while also advising governments on climate and health policies. These firms undermine the capabilities of the public sector through the outsourcing of traditional public sector roles to these private interests. Consultancy firms foster private interests through their engagement with the higher education sector, and thereby weaken the tradition of transparent management of university affairs by accountable university councils. While private consultancies cannot be blamed for all the negative consequences for health and equity caused by the problems associated with globalisation and advanced capitalism, they have played a role in amplifying them. CONCLUSION: Addressing the negative impacts of global consultancy firms will require strengthening the public sector, enforcing greater transparency, accountability, and minimising conflicts of interest. It will also demand critical thought, counter discourses, and activism to reframe the narratives supporting neo-liberal ideas of governance that are promoted in both government and business arenas.