The article explores the best way to structure a company's board of directors when a big shareholder is involved. It compares a one-tier board, where all tasks are done by one board, to a two-tier board, where one board selects projects and another monitors them. The study shows that a two-tier board can help prevent big shareholders from interfering too much while still keeping them motivated to oversee the manager. This setup leads to higher profits compared to a one-tier board. The findings suggest that in places like Continental Europe where ownership is concentrated, two-tier boards could be a good choice. This supports recent corporate governance reforms that give companies the option to choose between one-tier and two-tier boards.