Question: Liv Kristine and Gerard Way, have which mutual occupations?

Context paragraphs:
Skintight: Skintight is the third album by Leaves' Eyes female vocalist and lyricist Liv Kristine.  It was released in August 2010 on Napalm Records.

King of Kings (Leaves' Eyes album): King of Kings is the sixth studio album by the German symphonic metal band Leaves' Eyes.  It contains guest appearances of a.o. Simone Simons from the Dutch symphonic metal band Epica and Lindy-Fay Hella from the Norwegian dark folk act Wardruna.  It is their last album with Liv Kristine on vocals.

Deus Ex Machina (Liv Kristine album): Deus Ex Machina is the first full-length album from former Leaves' Eyes frontwoman Liv Kristine.  Unlike her follow-up, "Enter My Religion", she only co-wrote two songs: the title track and "In the Heart of Juliet".  The song "3 am" is a duet between Liv Kristine and Nick Holmes of Paradise Lost.

Vervain (Liv Kristine album): Vervain is the fifth album by female vocalist and lyricist Liv Kristine.  It was released in 2014 on Napalm Records.

Libertine (Liv Kristine album): Libertine is the fourth solo studio album by the Norwegian artist Liv Kristine.

Enter My Religion: Enter My Religion is the second album by Leaves' Eyes female vocalist and lyricist Liv Kristine.  It was released in 2006 on Roadrunner Records.

Leaves' Eyes: Leaves' Eyes is a German-Norwegian symphonic metal band from Stavanger, Norway and Ludwigsburg, Germany.  They were formed in 2003 by Liv Kristine, the former lead singer of Theatre of Tragedy and the entire line-up of Atrocity.  To date, the band has released six studio albums, a single, six EPs, one live album and a DVD.

Gerard Way: Gerard Arthur Way (born April 9, 1977) is an American singer, songwriter, musician, and comic book writer who was the lead vocalist and co-founder of the rock band My Chemical Romance from its formation in September 2001 until its split in March 2013.  His debut solo album "Hesitant Alien" was released on September 30, 2014.  He also wrote the comic mini-series "The True Lives of the Fabulous Killjoys" and the Eisner Award-winning comic book "The Umbrella Academy".

Liv Kristine: Liv Kristine Espenæs (born 14 February 1976), better known as Liv Kristine, is a Norwegian singer-songwriter who has performed and composed songs mostly for various subgenres of heavy metal music.  She started her career in the music industry as a vocalist for the gothic metal band Theatre of Tragedy, and is the former lead vocalist for the symphonic metal band Leaves' Eyes.  She is known for her work in close association with her then-husband and leader of the German band Atrocity, Alexander Krull.

Nell Sigland: Ragnhild Westgaard Sigland (born November 13, 1976), mostly known by her stage name Nell Sigland, is a Norwegian singer from Hamar, best known as the lead vocalist of Norwegian gothic metal band Theatre of Tragedy as a replacement for Liv Kristine, from June 3, 2004 to October 2, 2010.  She was also the lead singer for Norwegian gothic rock band The Crest, founded by her husband Kristian Sigland and herself.

Supporting paragraphs: Liv Kristine Gerard Way
Answer: singer, songwriter