[1][6] Her father, Yun Kee Yuen worked for the Libby pineapple company as an office clerk and bookkeeper.

[4] Maul's parents sent her and her siblings to stay with David Beckwith, the cousin of a family friend, in Wisconsin during World War II in order to protect them.

She also cofounded the Molokai Humane Society, volunteered with the Girl Scouts, and served on the State Advisory Committee to the Department of Education on Title IV.

[4] Maul's parents decided to send Marybeth, her brother, and one of her sisters to Wisconsin with a family friend's cousin in an attempt to keep them safe during the war.

[8] Maul's clients were often plantation workers for the pineapple companies and she usually assisted them pro bono or at a lowered rate.

[2][9] From 1985 to 1992, Maul worked at the Department of Health settlement for former Hansen's disease patients at Kalaupapa as an administrator.