Question: What is the nationality of the illustrator who has done artwork for an American metalcore band formed in 1990?

Context paragraphs:
Rise Up Tour: The Rise Up Tour is a concert tour co-headlined by American metalcore band The Devil Wears Prada and American metalcore band Memphis May Fire.  The tour supports The Devil Wears Prada's Sixth studio album, "Transit Blues" and Memphis May Fire's fifth studio album, "This Light I Hold".  The second leg in Europe added Canadian post-hardcore band Silverstein as a third headliner supporting their eighth studio album "I Am Alive in Everything I Touch.

As I Lay Dying discography: The discography of American metalcore band As I Lay Dying consists of 6 studio albums, 2 compilation albums, 1 video album, 11 singles and 15 corresponding music videos as well as 1 split album with fellow metalcore band American Tragedy called "As I Lay Dying/American Tragedy".

Timescape Zero: Timescape Zero is an American metalcore band from Miami, Florida formed in 1991, they are seen as one of the lesser known bands which helped start the metalcore scene.  The band formed after the break-up of Hangman (who released only one song on a 7" compilation on Youthbus Records), when they replaced the original lead singer with Adel Souto of Feast of Hate and Fear fanzine.  Lyrical themes include social issues, religion, politics, mental illness, individualism and self-awareness.  Influenced by late 80s straight edge hardcore, Sheer Terror, Killing Time, Sick of It All, Charles Manson and Anton LaVey.

Slave to Nothing (song): "Slave to Nothing" is a song by American metalcore band Fit for a King.  It's the second single from the album Slave to Nothing.  The song has a music video and features Mattie Montgomery, vocalist for metalcore band For Today.

Converge (band): Converge is an American metalcore band formed by vocalist Jacob Bannon and guitarist Kurt Ballou in Massachusetts in 1990.  During the recording of their seminal fourth album "Jane Doe", the group became a four-piece with the departure of guitarist Aaron Dalbec and the addition of bassist Nate Newton and drummer Ben Koller.  This lineup has remained intact since.  They have released eight studio albums to date, beside three live albums and numerous EPs.  The band's sound is rooted in both hardcore punk and heavy metal and they are considered pioneers of both metalcore and its subgenre mathcore.

Florian Bertmer: Florian Bertmer is a German illustrator from the "hardcore punk", "grindcore" and metal scene.  He has done artwork for bands like "Converge", "Napalm Death", "The Hope Conspiracy", "The Dillinger Escape Plan", "Agoraphobic Nosebleed", "Pig Destroyer", "Doomriders", Kirk Hammett, Lucasfilm, Alamo Drafthouse and others.  His early works were reminiscent of "Pushead" while his later works have become more influenced by "Art Nouveau" and Occultism .  He fronted the band "Cheerleaders Of The Apocalypse".  He has also created several official movie posters in collaboration with Alamo Drafthouse Cinema and has designed deck art for skateboard companies such as Creature Skateboards or Substance Abuse.

Bleeding Through: Bleeding Through was an American metalcore band from Orange County, California.  Formed in 1999, the band blended influences stemming from modern hardcore punk, symphonic black metal, and melodic death metal.  Although the band was often labeled as simply metalcore, when Brandan Schieppati was asked if he considered Bleeding Through a hardcore band, he said: "I think we're a hardcore band and I'll never say we are a metal band, we're all hardcore kids and we came from the hardcore scene.  Ours is just a different version of hardcore, we're trying to do something which adds a different variety to the hardcore scene, which has been sounding the same way for so long."

Tracing Back Roots: Tracing Back Roots is the third studio album by American metalcore band We Came as Romans.  It was released on July 23, 2013 through Equal Vision Records.  The album is noted for the band's shift from their signature metalcore sound to a more melodic, clean vocal driven sound, while still maintaining metalcore elements throughout.  The album has been received with favorable reviews which praise the band's “go out and do something with your life with purpose” message.

Century (American band): Century is an American metalcore band formed in 2005 by multi-instrumentalist/ArmsBendBack guitarist Carson Slovak.  Century was originally conceived as a solo project, but later evolved into a complete band.  Slovak writes all of Century's music, and designs all of the artwork and merchandise.  In 2005 the band signed a contract with Tribunal Records.  On February 7, 2006, Century released its first studio album, "Faith and Failure" through Tribunal Records.  This album saw Carson Slovak as guitarist and producer joined by Mike Guiliano (guitar), Huggie (bass) and Grant McFarland (drums).  Before the album was released, McFarland left to focus more on his current band This or the Apocalypse and was replaced by new drummer Matthew Smith.

Deadguy: Deadguy was an American metalcore band from New Brunswick, New Jersey.  The band formed in 1994 and disbanded in 1997.  The band is considered to have played an important role in the development of the metalcore fusion genre, their sole studio album "Fixation On A Co-Worker" being cited as a classic within the genre by some.  In 2006, Decibel magazine included the album in its "Hall of Fame" list.

Supporting paragraphs: Florian Bertmer Converge (band)
Answer: German