John Abele, Vermont
Abele's $640 million wealth is from the health care industry. He co-founded medical device manufacturer Boston Scientific in 1979, which provides less invasive treatments for patients. He retired in 2005 and eventually sold most of his shares.
Jacqueline Mars, Virginia
Mars's $28.1 billion net worth is thanks to her one-third holding of Mars Inc., the world's largest candy maker. Founded by her grandfather, she worked under the company for nearly 20 years and served on its board until 2016.