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The Energy Frontier Research Center (EFRC), entitled Center for Materials at Irradiation and Mechanical Extremes focuses on the development of extreme environment-tolerant materials via atomic scale design of interfaces. This Center recognizes that the challenge to developing materials with radically extended performance limits at irradiation and mechanical extremes will require designing and perfecting atom- and energy- efficient synthesis of revolutionary new materials that maintain their desired properties while being driven very far from equilibrium. A primary aspect associated with this challenge is to develop a fundamental understanding of how atomic structure and energetics of interfaces contribute to defect and damage evolution in materials. To this end, recent experimental and modeling work performed in our Center has shown that interface structure influences hydrogen absorption as well as point defect recombination. This presentation will focus on these results and their implications.