All PhD students have to work with at least one supervisor, and it is the most important academic relationship that you will form during your doctorate. A good relationship can be immensely helpful to you and your research, but a bad relationship can drag you down and be a significant causal factor in a failed PhD. Although it is possible to change supervisors, your first strategy should be to try to work with your current supervisor and try to improve the relationship. In this article, Dora Farkas explains some of the difficult personalities you may encounter, and how to deal with them. It is well worth reading, but if you find yourself in need of additional support then there are experts at the PhD Consultancy who can help.