Since 2011, Australia-based Atlas Wealth has been a major, and increasingly visible, adviser to Australian expats around the world – including those living in the United States.

A reader asks: ‘How do I navigate the shoals of being between U.S. and French citizenship, without having to put all my assets into cash and sticking them under my mattress for a few years?’

For the past four years, U.S. born, France-resident and French-speaking Fabien Lehagre has been fighting a tireless and increasingly hard-to-miss battle on behalf of all of France's and Europe's "accidental Americans"...