Jill has taught law at numerous universities, including Ife and Ahmadu Bello Universities in Nigeria, Warwick University and University of Hong Kong over a period spanning 40 years after having studied law from the London School of Economics and the Yale Law School. Towards the end of her teaching career, she developed a particular interest for Economic, Social and Cultural Rights. She also has extensive experience in advising on constitutions, including in Kenya, Nepal and Iraq. She is a Director of Katiba Institute and has participated in numerous constitution making processes in the region including East Timor, Nepal, Maldives, Iraq and Somalia.