Choudhury is a practising lawyer and was a Senior Partner of Khaitan & Co., one of the oldest and most renowned law firms in India. He is now the Senior Consultant of the said firm. A widely travelled professional both in and out of the country, Choudhury has been advising diverse clientele of business and financial enterprises, large business houses, multinational organisations, banks, financial institutions, government bodies and investment banks.
Out of multifarious activities of his life, Choudhury always works out of the time in writing articles for law and has penned innumerable articles. His articles titled lawyer's strike and terrorism published in a leading newspaper were widely applauded. He has co-authored the book Judicial Reflections of Justice Bhagwati which has been treated as a reference book by several universities in India as also in foreign countries. He is a leading member of several NGOs. Choudhury is the Chairman of Mano Vikas Kendra, a leading institution of differently abled children and is the President of Indian National Forum of Art and Culture, a premier organization in India in promoting art and culture and helping the needy and deserving artists.