Felix Arvid Ulf Kjellberg, better known by his online alias PewDiePie, is a Swedish web-based comedian and video producer, best known for his Let's Play commentaries and vlogs on YouTube.

Born in Gothenburg, Sweden, PewDiePie originally pursued a degree in industrial economics and technology management at Chalmers University of Technology. In 2010, during his time at the university, he registered his PewDiePie YouTube account. The following year he dropped out of Chalmers to focus on his YouTube channel, much to the chagrin of his parents. Having been refused support from them, PewDiePie began working at a hot dog stand to fund his videos. PewDiePie soon gathered a rapidly increasing online following, and in 2012, his channel surpassed one million subscribers.

Since 15 August 2013, PewDiePie's channel has been the most subscribed user on YouTube, being surpassed briefly in November and December 2013 by YouTube's Spotlight channel. Holding the position since 22 December 2013, the channel has reached over 48 million subscribers, as of October 2016. On 19 July 2014, the channel surpassed singer Rihanna's Vevo account on YouTube to become the most viewed channel of all time, and as of October 2016, the channel has received over 13.5 billion video views. In 2016, Time magazine named him one of "The World's 100 Most Influential People".

PewDiePie refers to his fanbase as the "Bro Army", and individual fans as "bros". Through his Bro Army fanbase, PewDiePie has raised money for charities. Due to his popularity, PewDiePie's coverage of indie games has created an Oprah effect, boosting sales for titles he plays. PewDiePie lives in Brighton with his girlfriend, Italian YouTube personality Marzia Bisognin.

PewDiePie was born and raised in Gothenburg, Sweden. He was born to Lotta Kristine Johanna (born 7 May 1958) and Ulf Christian Kjellberg (born 8 January 1957), and grew up with his sister, Fanny, as well. His mother Johanna, a former KappAhl CIO, was named the 2010 CIO of the Year in Sweden. His father, Ulf, is also a Chief Executive of a company.

During his early schooling life, he was interested in art, and has noted that he would draw popular video game characters such as Mario and Sonic the Hedgehog. During high school, he would skip classes to play video games at an Internet cafe with friends; on this topic, PewDiePie has commented, "Sweden has a great culture around gaming." In 2008, he graduated from Göteborgs Högre Samskola. He then went on to pursue a degree in industrial economics and technology management at Chalmers University of Technology, but left the university in 2011 to focus on his YouTube career. On this decision, PewDiePie has stated, "Thinking about it now, it was utterly absurd. To get into Chalmers for industrial economics you need straight A's, but somehow I was happier selling hot dogs and making my own gaming-videos."

Personal life:
Kjellberg is originally from Sweden but moved to Italy to live with his girlfriend, Marzia Bisognin (CutiePieMarzia); she is also a YouTube personality. The two were introduced to each other through a friend of Bisognin's in 2011, and after establishing an online friendship, Kjellberg flew to Italy to meet her.

The two shuffled between Sweden and Italy, before settling in Brighton, Sussex, England. Kjellberg moved to the UK in July 2013 for better Internet connectivity. Kjellberg admits that he enjoys living in Brighton, as he is able to live in general anonymity, adding that one of the reasons he has not moved to Los Angeles is, "Anytime I'm there, people are constantly patting you on the back, telling you how great you are. It fucks with your brain. I started YouTube because I was bored, not to become famous." In June 2016, Kjellberg announced he had been evicted from his recording studio after a neighbour confronted him for being too loud.

Kjellberg has stated on his YouTube channel that he is an agnostic atheist.