The Long Term Ecological Research Network (LTERN) is the 40th InCommon identity provider to federate with the CILogon Service (https://cilogon.org/). LTERN is also the first identity provider operated by a research project, rather than a university or corporation, to connect with CILogon. For researchers from campuses that are not yet InCommon participants, it is convenient to use an existing research project login for federated access to cyberinfrastructure. For example, many existing LTERN users are expected to use DataONE, so the LTERN identity provider will allow those users to easily access DataONE resources with their existing credentials. We expect additional research project identity providers to connect with CILogon in the future. If you would like an identity provider added to CILogon, please submit our IdP request form.