As an invited lecturer, SCL's Vladimir Slavnic visited Tehran, Iran from 13 to 19 December 2011, where he participated in the 4th Workshop on High Performance and Grid Computing, held at the Institute of Research in Fundamental Sciences (IPM). Through morning lectures and afternoon hands-on sessions, this workshop covered various topics and concepts of Grid and High Performance Computing.Vladimir Slavnic lectured on e-Science and Grid computational infrastructures, introduced Grid projects (EGI-InSPIRE) and middlewares, as well as gLite specific topics such as security, virtual organizations concept, information system, workload and data management. Together with IPM colleagues, Vladimir Slavnic held a series of hands-on sessions where...