High-energy particle accelerators are a prominent source of radiation, to which the various nearby electronics systems, critical to the accelerator operation, are exposed to. Hence, the radiation tolerance of such systems needs to be accounted for during their design phase, and validated experimentally. At CERN, the Radiation to Electronics (R2E) project is responsible for providing the necessary support to ensure an adequate performance of its accelerator infrastructure, with regards to radiation exposed electronics. Such support comes mainly in the form of (a) radiation monitoring and calculation, (b) radiation effects mitigation at circuit and system level, (c) operation of CERN irradiation facilities and (d) radiation testing of electronic components and systems.