Following the Peoples National Movements defeat in the 2010 general election, Rowley was appointed as Leader of the Opposition on the 1st June. He was then elected political leader of the People's National Movement as he was seen as the most capable to lead the party. As political leader he advocated implementation of the one man, one vote system within the party. Rowley has served on several parliamentary committees. In 2004, he chaired the Joint Select Committee of Parliament which examined and made recommendations for the live broadcasting of parliamentary debates. He served as the representative governor of Trinidad and Tobago for the Inter-American Development Bank and the Caribbean Development Bank.