Richard Nickl coauthored nonparametric Bernstein-von Mises theorems with Ismaël Castillo for the Gaussian white noise model. Their work explains when Bayesian credible sets can also have asymptotically correct frequentist coverage probability. The result connects the limiting posterior geometry with efficient inference on an unknown function, rather than only a fixed finite-dimensional parameter.[ref]
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As of my last update in October 2023, there is no widely recognized information about a person or entity named Richard Nickl. It's possible that he could be a private individual or a figure not extensively covered in mainstream sources.