Leong co-founded
Cavendish Publishing in 1990. The company made £250,000 in its first year. By 2003, it was the largest independent law publisher in the United Kingdom. He left Taylor & Francis in 2007 to join One Charter, a private jet business, as a non-executive director. Formerly the Chair of Chinese for Labour, in October 2022, it was announced that he would receive a
life peerage in the
2022 Special Honours. On 31 October 2022, he was created
Baron Leong,
of Chilton in the County of Oxfordshire and of Camden Town in the London Borough of Camden. He was made a Government Whip in the Lord's in July 2024. He is a member of the
Fabian Society. ==Personal life==