Bull graduated with First Class Honours from Trinity College, Oxford University in 1992, and was called to the Bar of England and Wales the next year. He was ranked fourth in the Bar Examinations; when he returned to Singapore, he topped the local Bar Exams. He served as a Justices' Law Clerk to former Chief Justice Yong Pung How before joining Drew & Napier in 1994, and left for Harvard Law School in 1995 on a Lee Kuan Yew scholarship to pursue an LL.M.. He then passed the New York Bar Exams and joined Sullivan & Cromwell as a litigation associate.
Bull re-joined Drew & Napier and was made a partner in 1998. He is heavily involved in commercial litigation and is cited regularly by Chambers Global and Asia Pacific Legal 500 as one of Singapore's top lawyers. In 2008, he was appointed Senior Counsel, the tenth lawyer to be made Senior Counsel before turning 40. Bull is also occasionally involved in academic writings, having written on subjects such as civil procedure. He has sat on various review committees, such as one chaired by the Attorney-General of Singapore in 2006 regarding the supply of foreign lawyers in Singapore. In 2010, he was named deputy chairman of the Singapore International Arbitration Centre, and in 2011, he was appointed vice-president of the Asia Pacific Regional Arbitration Group.
- Singapore Technologies Electronics (2009-2012)
- National Healthcare Group (2009-2012)
- Singapore University of Technology and Design (2009 - 2015)
- Ascendas Property Fund Trustee (2010-2013)
- Agri‑Food and Veterinary Authority of Singapore (2004-2010)
Bull and his two elder sisters were raised single-handedly by his mother after his father died when he was 15 months old. He studied at Anglo-Chinese School and Anglo-Chinese Junior College.
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