Abstract
I had the privilege and the pleasure to work closely with Stephen J.Pennycook for about twenty years,having a group of post-docs and Vanderbilt-University graduate students embedded in his electron microscopy group at Oak Ridge National Laboratory,spending on average a day per week there.We combined atomic-resolution imaging of materials,electron-energy-loss spectroscopy,and density-functional-theory calculations to explore and elucidate diverse materials phenomena,often resolving long-standing issues.This paper is a personal perspective of that journey,highlighting a few examples to illustrate the power of combining theory and microscopy and closing with an assessment of future prospects.
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