Poznan Supercomputing and Networking Center (PSNC) was established in 1993 as a research laboratory of the Polish Academy of Sciences and is responsible for the development and management of the national optical research network, high-performance computing and various eScience services and applications in Poland. The optical network infrastructure called PIONIER is based on dedicated fibres and DWDM equipment owned by PSNC. PSNC has several active computer science research and development groups working on a variety of aspects including: innovative applications, Grid portals, digital media services, mobile user support technologies and services, digital libraries, tools for network management, optical networks and QoS management. As it was demonstrated in many international projects founded by European Commission, PSNC experts are capable of bringing unique IT capabilities to the research and e-Science based on many experiences in the 5th, 6th and 7th Framework Programs. An active participation in the design and development of high-speed interconnects, fiber-based research and education networks allows PSNC today to be a key member of pan-European GEANT optical network connecting 34 countries through 30 national networks (NRENs). PSNC is also participating in the biggest scientific experiments offering the access to large scale computing, data management and archiving services. In addition we have been engaged in European initiative of building high performance computing e-Infrastructure - PRACE which will end in provisioning of permanent future Petaflops supercomputing installations involving reconfigurable hardware accelerators. Another branch of PSNC activity is the hosting of high performance computers, including SGI, SUN and clusters of 64-bit architecture PC application servers. PSNC was participating in multiple national and international projects (Clusterix, ATRIUM, SEQUIN, 6NET, MUPBED, GN2 JRA1, GN2 JRA3, GN2 SA3). It was also a coordinator of pan-European projects such as GridLab, PORTA OPTICA STUDY and PHOSPHORUS and took an active part in many other EU projects such as HPC-Europe, OMII-Europe, EGEEI/II, ACGT, InteliGrid or QosCosGrid. The remarkable experience gained from these projects will benefit in a professional and high quality input for the MAPPER project.