Arackaparambil Kurien Antony, better known as A. K. Antony (born 28 December 1940) is an Indian politician and attorney who was the 23rd Defence Minister of India. He is the current Member of Parliament in the Rajya Sabha from Kerala for the fifth term since 1985 He also currently serves as the Chairman of the Disciplinary Action Committee of the All India Congress Committee Congress Working Committee and member of the Congress Core Group and Central Election Committee.
Antony previously served as Defence Minister making him the person who served the longest in this post in India. He has also been three times as Chief Minister of Kerala and Leader of Opposition in Kerala Legislative Assembly.
Source- Wikipedia