To further scientific and technological cooperation between the United States and the European Community, the National Science Foundation and the European Research Council signed an Implementing Arrangement on July 13, 2012 to enable U.S. scientists and engineers with NSF-funded CAREER awards and Postdoctoral Research Fellowships to pursue research collaboration with European colleagues supported through EU-funded European Research Council (ERC) grants. Connecting researchers with complementary strengths and shared interests promotes scientific progress in solving some of the world’s most vexing problems. This international research opportunity is mutually beneficial to the U.S. participants and the hosts through cooperative activities during research visits and establishing international research partnerships to enrich future research activities in the U.S. and Europe. Under the Arrangement, the ERC Executive Agency (ERCEA) identifies ERC-funded research groups who wish to host NSF Postdoctoral Research Fellows for research visits of up to one year within their ERC funding. The 2018 Dear Colleague Letter for this opportunity noted that 2018 would be the final year in its current form. NSF is extending the current opportunity for one additional year. NSF intends to announce a new, related opportunity in FY 2020. Requests must be received at NSF at least 3 months prior to the proposed visit, but no later than June 21, 2019, for consideration using Fiscal Year 2019 funds.