He has a Diploma in Law from the School of Oriental and African Studies, University of London. He also holds a Master of Laws from University College London. He is an advocate and solicitor in Singapore, as well as Barrister-at-law in England, Wales and Hong Kong.
Mr. Wei began practicing law in Hong Kong in the 1970s before joining the teaching profession. He has been a professor of law at the National University of Singapore and at the Singapore Management University.
Apart from teaching, he served as member of the Copyright Tribunal of Singapore. He was a Professorial Fellow at the IP Academy, and an associate member of the Society of Public Teachers of Law (UK).
His publications include the Law of Copyright in Singapore, An Introduction to Genetic Engineering, Life Sciences and the Law, and Industrial Design Law in Singapore. He was also a contributing author to Intellectual Property and Biological Resources: Perspectives on Contemporary Issues.