Sithumini, who has been a Chartered Architect, is currently Senior Lecturer, Faculty of Architecture, University of Moratuwa, Sri Lanka, and Coordinator for Moving Image Communication Design. He is also Director of Education at the National Photographic Art Society, Sri Lanka. In the past, he has been a member of the Board of Architectural Publications, Sri Lanka Institute of Architects, and a Coordinator for ArtLink 2008 International Video Art Workshop. He has a B.Sc. in Built Environment, an M.Sc. in Architecture, and an M.A. in Linguistics.