Lis was first elected to the Vale of Glamorgan Council in May 2004. Following the 2012 election, Lis was appointed Cabinet Member and subsequently Deputy Leader,a role she resumed as Deputy Leader and Cabinet Member for Education and Regeneration in May 2019. Lis represents Stanwell ward, the ward where she was born and has lived for over thirty years.
Formerly Head of Social Entrepreneurship at the University of South Wales, Lis has also acted as an advisor to the Welsh Government and the Welsh Assembly on Social Enterprise and Cooperatives. She has previously run her own business, worked for a major UK multi-national company and as a consultant to NESTA, an innovation foundation. She has been involved in delivering innovative community to community aid projects in Uganda and in 2012 was invited to become a Fellow of the Royal Society of Arts in recognition of her contribution to social enterprise in Wales.
Wherever possible Lis, with her ward colleague Mark Wilson, checks the ward for litter, potholes and other issues. She is grateful to residents who report any problems as it helps to get them dealt with more more quickly. Lis also works with residents' groups and is very happy to help anyone who would like to set up their own group.