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I have a foggy memory of being at a hotel bar after some physics conference reception, and drinking next to Roger Penrose. He let us youngsters explain our research to him, which I think included explaining how pulsar timing can detect gravitational waves. 1/
I feel like he already knew how pulsar timing worked, but it& #39;s also possible he didn& #39;t. Either way, it was very kind of him to humor us young physicists and let us explain something to him! 2/
It& #39;s hard to overstate how much of GR research Penrose has touched. It& #39;s not just the formation of singularities, it& #39;s also the causal structure of spacetime (including event horizons), the asymptotic structure, spinors in spacetime, and so much more. 3/
One main quality that made Penrose so influential is his ability to make lucid a complicated concept. If you open up some of his books, they& #39;re packed full of beautifully illustrated diagrams that make the concepts click (at least for me, I& #39;m a very geometric/visual person) 4/
