> ex-pro ballet to HN? Can't imagine there's much crossover in that Venn!

It's perhaps not super common, but not as rare as you might think. Only a teeny tiny minority of ballet dancers have full careers, meaning they make it to the level of principal (the highest rank in a ballet company) and then retire in their 40s, usually to go on to another career in dance like teaching. Many more are like me, where we trained intensively as children, then made it into a company but saw that there'd be a ceiling on our advancement (meaning we'd only make it to corps de ballet or soloist level based on our ability), so left after a few years to do something else.

Then there are the fascinating outliers like Robert Wallace, who was a dancer with ABT and a principal at Boston Ballet (so the pinnacle of the career), then went to Yale at 32, graduated summa cum laude in economics, and now is CEO of Stanford Management Company where he runs Stanford's $50 billion endowment.