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The transfer of electrons across the interface between inorganic and organic materials is critical to the performance of organic light emitting diodes, field effect transistors, and photovoltaic devices. In their Feature Article on pp. 9–17, Drew et al. summarize experimental results that have advanced our understanding of spin-polarized charge carrier transfer across ferromagnetic metal/organic semiconductor interfaces. The authors highlight key spectroscopic studies that have revealed insights into the nature of the electronic structure, in particular between Alq3 and Co and Fe surfaces. They discuss the relationship between energy level diagrams for these systems and transport measurements made on spin-valve devices. The cover picture shows that the insertion of a LiF layer at the interface between a ferromagnetic electrode and the organic semiconductor in an organic spin valve can change the probability of extracting spin minority or spin majority carriers, due to a shift in the vacuum level.