4) Martin Naughton (Ranking: 831; Net worth: $2.2 billion)
This 75 year old billionaire left school early to gain experience working for an aviation firm and subsequently an electrical appliance company. He founded Glen Electric with a handful of people in 1973. He later acquired British heating company Dimplex. He built Glex Dimplex into the largest global manufacturer of electrical heating appliances.
3) John Dorrance III (Ranking: 713; Net worth: $2.5 billion)
This 70 year old Campbell’s Soup heir is the grandson of the Campbell’s founder. He renounced US citizenship and moved to Ireland recently. Currently he resides in South Dublin.
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