Good question! :) Possibly the most uncommon: exiting consulting to become a world renowned musician, song writer and actor. Grammy-winner John Roger Stephens (better known as John Legend) worked at BCG for three years before starting his incredibly successful musical career.
Cheers, Sidi
(edited)
Super interesting question.
The most uncommon exit - as a Senior Business Analyst - I have ever heard of is a founder of a relevant European political party.
Uncommon in the sense that it was a completely unexpected shift in life: someone I know left the firm to become a farmer/vegetable vendor in Italy - partly helped by family connections, but he left the corporate life behind to live in his home country in the countryside. The last time I spoke to him, he was very happy with his choice.
Hi Stephen,
The most uncommon was the Deputy Minister of Economic Development in Russia.
All the best,
Egor
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MBB Structuring Mastery by Sidi 
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