Harold W. Thimbleby (born 19 July 1955) is a British professor of computer science at Swansea University, Wales. He is known for his works on user interface design within the realm of human computer interaction.Harold Thimbleby held the post of director of UCLIC, University College London's Interaction Centre, from its establishment in 2001. From 2001 to 2004, he was also the 28th Professor of Geometry at Gresham College, London. Thimbleby founded the Future Interaction Technology Lab at Swansea University in 2005.