Urban Development Expert at Tanya Zack Development Planners and Visiting senior lecturer at University of the Witwatersrand. Dr. Tanya Zack is a South African planner specializing in urban policy, regeneration, informality and sustainable development. She has been an advisor and consultant in the development arena for over 25 years and has worked locally and internationally with senior level clients in government, academic institutions, the private sector, and directly with the communities.