Mary Zimmer is a voice coach, whose YouTube channel is VoiceHacks. She is part of the Monster Factory, voice creator for video games. (https://www.lafabriquedemonstres.com/fr/cb-profile/maryzimmer) In her career, Mary Zimmer sang (clean vocals) in several musical projects. The supergroup White Empress is made up of former members of Ugly Kid Joe, Coal Chamber, among others, and the ex-guitarist and main songwriter of Cradle of Filth. Mary Zimmer was a singer in the group from 2013 to 2016.