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Large High Energy Physics (HEP) experiments adopted a distributed computingmodel more than a decade ago. WLCG, the global computing infrastructure forLHC, in partnership with the US Open Science Grid, has achieved data managementat the many-hundred-Petabyte scale, and provides access to the entire communityin a manner that is largely transparent to the end users. The main computingchallenge of the next decade for the LHC experiments is presented by the HL-LHCprogram. Other large HEP experiments, such as DUNE and Belle II, havelarge-scale computing needs and afford opportunities for collaboration on thesame timescale. Many of the computing facilities supporting HEP experiments areshared and face common challenges, and the same is true for software librariesand services. The LHC experiments and their WLCG- partners, DUNE and Belle II,are now collaborating to evolve the computing infrastructure and services fortheir future needs, facilitated by the WLCG organization, OSG, the HEP SoftwareFoundation and development projects such as HEP-CCE, IRIS-HEP and SWIFT-HEP. Inthis paper we outline the strategy by which the international HEP computinginfrastructure, software and services should evolve through the collaborationof large and smaller scale HEP experiments, while respecting the specific needsof each community. We also highlight how the same infrastructure would be abenefit for other sciences, sharing similar needs with HEP. This proposal is inline with the OSG/WLCG strategy for addressing computing for HL-LHC and isaligned with European and other international strategies in computing for largescale science. The European Strategy for Particle Physics in 2020 agreed to theprinciples laid out above, in its final report.

HEP computing collaborations for the challenges of the next decade