On 9th of December 1984, Mariel got married to Stephen Crisman. Stephen Crisman is a popular name in the film industry as he is a producer, director and writer. As a loving spouse, they welcomed two children together and they announced their separation in 2008. They finally got divorced in 2009.
Two years later, Mariel was spotted with Bobby Williams. They were found having romantic love affairs. Bobby Williams is a former stuntman and he is also a great writer. They announced that they are officially in love in April 2015. Her nationality is American.
Though Mariel was born in Mill Valley, California, she spent her childhood days in Ketchum, Idaho, Los Angeles and New York City. Her older sister Margaux Hemingway died of a barbiturate overdose in the mid 1990s and the death of her sister put her in a mental illness. She made her acting debut in 1976 by starring the role of Kathy McCormick in an American rape and revenge thriller film Lipstick. She was aged 14 years old when she made her acting debut. She also earned her nomination in Golden Globe Award from her debut role. That year she was also seen in the TV movie I Want to Keep My Baby. Few years later, she appeared in an American romantic comedy-drama film Manhattan where she played the role of Tracy. This role also earned her first nomination in Academy Award and BAFTA Award. She became popular as a renowned actress while she was still in her late teens. In the 1980s, she starred in the movies like Personal Best, Star 80, The Mean Season, Steal the Sky and so on. She has also authored several books named Running With Nature, Out Came the Sun, Invisible Girl and so on. Her net worth is $12 million dollars.