Born and raised in Alor Setar, Kedah, Mahathir excelled at school and became a medical doctor. He became active in the United Malays National Organisation (UMNO), Malaysia's largest political party, before entering parliament in 1964. He served one term before losing his seat, before falling out with the then Prime Minister, Tunku Abdul Rahman and being expelled from UMNO. When Abdul Rahman resigned, Mahathir re-entered UMNO and parliament, and was promoted to the Cabinet. By 1976, he had risen to Deputy Prime Minister, and in 1981 was sworn in as Prime Minister after the resignation of his predecessor, Hussein Onn.
During Mahathir's tenure as Prime Minister, Malaysia experienced rapid modernisation and economic growth, and his government initiated a series of bold infrastructure projects. He was a dominant political figure, winning five consecutive general elections and seeing off all of his rivals for the leadership of UMNO. However, his accumulation of power came at the expense of the independence of the judiciary and the traditional powers and privileges of Malaysia's royalty. He also deployed the controversial Internal Security Act to detain activists, non-mainstream religious figures, and political opponents including his sacked deputy, Anwar Ibrahim. Mahathir's record of curbing civil liberties and his antagonism to western diplomatic interests and economic policy made his relationships with the likes of the US, Britain and Australia difficult. As Prime Minister, he was an advocate of third-world development and a prominent international activist for causes such as the anti-apartheid movement in South Africa and the interests of