Answer the question at the end by quoting:

Albrecht Durer (; German: ['albRect 'dy:Ra]; 21 May 1471 - 6 April 1528) was a painter, printmaker, and theorist of the German Renaissance. Born in Nuremberg, Durer established his reputation and influence across Europe when he was still in his twenties due to his high-quality woodcut prints. He was in communication with the major Italian artists of his time, including Raphael, Giovanni Bellini and Leonardo da Vinci, and from 1512 he was patronized by emperor Maximilian I. Durer is commemorated by both the Lutheran and Episcopal Churches.
Durer was born on 21 May 1471, third child and second son of his parents, who had at least fourteen and possibly as many as eighteen children. His father, Albrecht Durer the Elder (originally Albrecht Ajtosi), was a successful goldsmith who in 1455 had moved to Nuremberg from Ajtos, near Gyula in Hungary. One of Albrecht's brothers, Hans Durer, was also a painter and trained under him. Another of Albrecht's brothers, Endres Durer, took over their father's business and was a master goldsmith. The German name "Durer" is a translation from the Hungarian, "Ajtosi". Initially, it was "Turer", meaning doormaker, which is "ajtos" in Hungarian (from "ajto", meaning door). A door is featured in the coat-of-arms the family acquired. Albrecht Durer the Younger later changed "Turer", his father's diction of the family's surname, to "Durer", to adapt to the local Nuremberg dialect. Albrecht Durer the Elder married Barbara Holper, the daughter of his master when he himself became a master in 1467. Durer's godfather was Anton Koberger, who left goldsmithing to become a printer and publisher in the year of Durer's birth and quickly became the most successful publisher in Germany, eventually owning twenty-four printing-presses and having many offices in Germany and abroad. Koberger's most famous publication was the Nuremberg Chronicle, published in 1493 in German and Latin editions. It contained an unprecedented 1,809 woodcut illustrations (albeit with many repeated uses of the same block) by the Wolgemut workshop. Durer may have worked on some of these, as the work on the project began while he was with Wolgemut. Because Durer left autobiographical writings and became very famous by his mid-twenties, his life is well documented by several sources. After a few years of school, Durer started to learn the basics of goldsmithing and drawing from his father. Though his father wanted him to continue his training as a goldsmith, he showed such a precocious talent in drawing that he started as an apprentice to Michael Wolgemut at the age of fifteen in 1486. A self-portrait, a drawing in silverpoint, is dated 1484 (Albertina, Vienna) "when I was a child", as his later inscription says. Wolgemut was the leading artist in Nuremberg at the time, with a large workshop producing a variety of works of art, in particular woodcuts for books. Nuremberg was then an important and prosperous city, a centre for publishing and many luxury trades. It had strong links with Italy, especially Venice, a relatively short distance across the Alps.

When did he leave his apprentice work?

Answer the question at the end by quoting:

Cameron Ezike Giles (born February 4, 1976), better known by his stage name Cam'ron (formerly Killa Cam), is an American rapper, actor and entrepreneur from Harlem, New York. He is the de facto leader of East Coast hip hop group The Diplomats (also known as Dipset), and is a member of the duo U.N. (Us Now). Cam'ron was also a part of the group Children of the Corn before they disbanded in 1997.
In 2003 Cam'ron teamed up with his fellow Diplomats Members Jim Jones, Juelz Santana, and Freekey Zeeky to release the Diplomats' debut double disc album, Diplomatic Immunity, in 2003 under Roc-A-Fella/Diplomat Records, which was quickly certified gold by the RIAA. The album featured the lead single "Dipset Anthem", a remix to Cam'rons hit "Hey Ma" and the (street anthem) single "I Really Mean It", as well as boasting production from Kanye West, Just Blaze, and The Heatmakerz. A year later, the Diplomats released their second album, Diplomatic Immunity 2. Although not as successful as their debut, it still was boosted to gold status. Around this time in the height of his mainstream fame, Cam'ron was known for popularizing the color pink. During this period, Cam'ron was always seen wearing pink clothing and even bought an all-pink Range Rover, which can be seen in his video for "Killa Cam". Cam'ron's fourth studio album, Purple Haze, was released on December 7, 2004 on Def Jam/Roc-A-Fella Records. It featured collaborations with Kanye West, Jaheim, Twista, Juelz Santana, and various other artists and ultimately reached gold status. The album was also a critical success, being ranked 114th on Pitchfork Media's Top 200 Albums of the first decade of the 21st century List, and 10th on Rhapsody's Hip Hop's Best Albums Of The Decade List. However, after feeling that the album was poorly promoted and that his projects were not receiving the attention they deserved, Cam'ron requested his release from Roc-A-Fella Records. On April 28, 2005, Cam'Ron officially joined the Warner Music Group under the Asylum Records imprint. He began work on what would be his first project for the new label. Cam'ron's fifth studio album, titled Killa Season, was released on May 16, 2006 featuring production from long term collaborators The Heatmakerz, Charlmagne and Ty Fyffe, as well as others such as Alchemist and I.N.F.O.. Along with the album, Cam'ron released his first film, in which he wrote, directed and starred in, also titled "Killa Season". Despite selling 112,000 units in the first week and debuting at number 2 on the charts, Killa Season failed to have the same sales strength as his two previous releases, but Killa Season became certified gold. After the release of Killa Season and his feud with 50 Cent in 2007, Cam'ron took a three-year hiatus from music after his mother suffered three strokes which left her paralyzed on her left side. He moved to Florida with her to set up her rehabilitation and therapy, and stayed there until she had fully recovered. Cam'ron's 2009 album, Crime Pays was released on Asylum/Diplomat Records, featuring the majority of the production handled by Skitzo and AraabMuzik. Although none of the singles from, the album managed to chart, the album still reached number 3 on the Billboard 200 but only sold 150,000 units, making this the lowest selling album of his career. In 2009 Cam'ron formed a new label, Dipset West and new group the U.N..

What was Purple Haze?
Cam'ron's fourth studio album, Purple Haze,