Pewdiepie

Born in Gothenburg, Sweden, Kjellberg originally pursued a degree in industrial economics and technology ,management at Chalmers University of Technology in Gothenburg. In 2010, during his time at the university, he registered a YouTube account under the name PewDiePie. The following year, he dropped out of Chalmers after losing interest in his degree field, much to the dismay of his parents. After failing to earn an apprenticeship with an advertising agency in Scandinavia, he then decided to focus on creating content for his YouTube channel. In order to fund his videos, Kjellberg began selling prints of his Photoshop art projects and worked at a hot dog stand. Kjellberg soon gathered a rapidly increasing online following, and in July 2012, his channel surpassed one million subscribers.

On 15 August 2013, Kjellberg became the most-subscribed user on YouTube, being briefly surpassed in late 2013 by YouTube Spotlight and being very briefly surpassed by T-series on 22 February 2019 for approximately 8 minutes. The channel has maintained the top position since recapturing the distinction on 23 December 2013, and has amassed over 86 million subscribers as of February 2019. From 29 December 2014 to 14 February 2017, Kjellberg's channel was the most-viewed YouTube channel. As of February 2019, the channel has received over 20 billion video views, ranking as the 8th-most viewed on the platform.
 https://www.engadget.com/2017/09/11/pewdiepie-outburst/