Hila Klein

In August 2019, Ethan came out in support of 2020 Democratic presidential candidate Andrew Yang, whose platform revolves around the impact of technological development and automation on job displacement. Following Andrew Yang's dropout from the 2020 Democratic race, Ethan proceeded to endorse presidential candidate Bernie Sanders.

In September 2018, h3h3Productions released a game on the App Store and Google Play called "H3H3: Ball Rider". The game was developed by Outerminds and features many references to some of their most well-known videos.

The H3 Podcast channel was registered by the Kleins on April 8, 2017, on which they upload recordings of their weekly podcast.

Court filings from November 2016 state that Ethan and Hila Klein had new attorneys and were no longer represented by Morrison & Lee LLP. Later claims by both Ethan and Hila that the switch was due to among other reasons, "things not working out". They also discussed that the alleged fees charged by the new firm were US$54,146.57 for one month of work. There is currently no evidence that Morrison & Lee LLP had ever controlled the funds raised by H3h3Productions, and Morrison & Lee LLP has not confirmed the allegation. On March 17, 2017, the trial set for April 17, 2017 was adjourned in anticipation of ruling on summary judgment motions.

On August 23, 2017, Ethan tweeted that they won the lawsuit. In her decision in favor of Ethan and Hila, U.S. District Judge Katherine B. Forrest ruled that the Kleins' commentary video constituted "fair use as a matter of law", describing it as "quintessential comment and criticism." The case is the first of its kind to receive a judgment, and while not binding across the United States, provides a significant and persuasive argument to be cited in future cases relating to fair use on YouTube.

H3h3Productions, alongside several other channels, supported YouTube personality PewDiePie amid a 2017 controversy over Nazi jokes in one of his videos from January. On February 14, The Wall Street Journal ran a story about PewDiePie's previous references to Adolf Hitler, which brought nine other videos into the debate and elicited frequent discussions on whether they were taken out of context. When YouTube subsequently released tools to allow advertisers to avoid offensive videos, Ethan Klein claimed that the tools were overly broad and negatively affected unrelated content, including his own channel.

From September 5 to September 12, 2017, Ethan and Hila, along with Justin Roiland, Alex Hirsch, Dana Terrace and YouTube prankster Joey Salads, raised over US $200,000 in donations to Direct Relief for relief efforts in Houston, Texas, in the aftermath of Hurricane Harvey, which caused massive damage to the city.

In 2017, Hila Klein founded her own clothing company named Teddy Fresh.

The channel has gained a reputation for critiquing internet trends and a range of online personalities, as well as several YouTube policies. On July 15, 2016, after winning a Hot 97 contest, Ethan met DJ Khaled and showed him a series of comedy videos. The pair have responded to several online controversies, many of which concern badly received prank videos posted to the site. The Kleins leased a short documentary on Counter-Strike: Global Offensive gambling, which involves trading skins for real-world currency. The channel criticized several YouTubers for attempting to attract young viewers to their gambling websites.

In April 2016, Matt Hosseinzadeh—an Iranian-American YouTuber who goes by "MattHossZone" and "Bold Guy"—filed a civil action against the Kleins for copyright infringement. h3h3Productions made a reaction video to Hosseinzadeh's video "Bold Guy vs. Parkour Girl". Hosseinzadeh claims that he initially contacted the Kleins "to politely ask them to remove my content from their video", but that they refused. Hosseinzadeh's lawyer, Tim Bukher, claims that the video used more than 70% of his work "while contributing nothing substantive to it."

After a video on this was released by h3h3Productions the following month, fellow YouTube personality Philip DeFranco started a fundraiser on GoFundMe to help raise money for their legal fees, citing the need to protect fair use on YouTube. The fundraiser raised almost $170,000, receiving large donations from notable individuals including Fine Brothers, Markus "Notch" Persson, PewDiePie, Markiplier, Jacksepticeye, Justin Roiland, and Garry Newman. On May 26, 2016, Ethan and Hila announced that the funds raised will go into an escrow account called the "Fair Use Protection Account" (FUPA), overseen by Morrison & Lee LLP to be used to help people defend fair use. On June 27, 2016, Lee announced on Twitter that he had filed a motion to dismiss the lawsuit.

After several years together, the couple married on October 12, 2012. During the early years of the channel, the couple lived together in Israel, in the Florentin neighborhood of Tel Aviv. In April 2015, the Kleins moved to the United States, first living in Los Angeles then moving to New York City in September 2015 and then back to Los Angeles in August 2016. Even though they celebrate Jewish holidays, both of them identify as agnostic atheists. The couple own two Yorkshire terriers named Shredder and Alfredo. The couple have a son named Theodore Yochanan Klein, named after Hila's father, Yochanan.

The Kleins registered the h3h3Productions YouTube channel on April 29, 2011. The primary format of videos uploaded to the channel involves the Kleins providing critique and commentary in reaction videos, consisting of clips of a source video intermixed with commentary and absurd sketches, a style which has been described as a cross between the works of comedy duo Tim & Eric and the television series Mystery Science Theater 3000.

Hila Klein (née  Hakmon; Hebrew: הילה חכמון ) was born on December 12, 1987 in Holon, Israel to a Sephardic Jewish family. Hila served as a soldier in the Israel Defense Forces for two years. During her military service, she met Ethan Klein in 2007 while he was visiting the Holocaust Museum in Jerusalem at the time on his Birthright Israel trip. She then attended the Shenkar College of Engineering and Design in Israel, but did not complete her studies. Hila became a naturalized U.S. citizen in September 2019.

Ethan Edward Klein (born June 24, 1985) and Hila Klein (née Hakmon; born December 12, 1987) are an American-Israeli husband and wife duo best known for their YouTube channel h3h3Productions. The majority of content on their main channel comprises reaction videos and sketch comedy in which they satirize internet culture, and the pair also run a separate podcast channel.

Ethan Edward Klein was born on June 25, 1985 in Ventura, California, to an Ashkenazi Jewish family. His parents are Gary and Donna Klein, and he attended Buena High School. Ethan studied English Literature at the University of California, Santa Cruz from 2004 to 2009, and he graduated with a Bachelor of Arts degree in creative writing. His paternal grandfather was film and television producer Leonard Katzman. He has mild Tourette syndrome resulting in noticeable twitching of his eyebrows.