Scientists often lament their lack of influence on environmental policy-making. Some proposed solutions, like teaching scientists to communicate more effectively, can be helpful, but are not necessarily sufficient. Instead, connecting science and policy may often require a separate kind of expert: full-time intermediaries who facilitate the complicated exchange of information among scientists, policy-makers, and other stakeholders. In this paper, we describe intermediary efforts by the Lenfest Ocean Program, a grant-making program that funds peer-reviewed research and connects scientists and decision-makers who can take action on an issue. We present case studies of intermediary work on three topics: first, sustainable methods of harvesting bull kelp in the US Pacific Northwest; second, the design of catch share programs in US fisheries; and third, management of forage fish. These case studies suggest that science-policy intermediaries can help scientists make meaningful contributions to public discourse.