Jensen-Gerard Karp is an American producer, writer, actor, podcaster, gallerist, and former rapper. Previously known by his stage name Hot Karl, he signed a record deal with Interscope in his early 20s and has gone on to produce and write for television and radio.

Karp was raised in Calabasas, California. After a brief stint in hip-hop at 11 years old signed for management to Ice-T's Rhyme Syndicate, Karp entered the Roll Call freestyle competition on Los Angeles radio station Power 106, during his time at USC, where he lasted a record 45 days on air to become the show's all-time champion. Karp created a demo exhibiting his satirical style and tightly wound rhymes. He eventually signed with Interscope Records for what he said was a million dollars, where he recorded what was to be his debut album, Your Housekeeper Hates You, which included guest appearances by Redman, Kanye West, will.i.am, DJ Quik, Fabolous, Mýa, Sugar Ray, DJ Clue, and MC Serch. However, Interscope informed Karl that his album could not be commercially released due to scheduling conflicts and he decided to leave Interscope. In 2013, Karp recorded his first song in 10 years for his favorite basketball team, the Los Angeles Clippers, at the request of DJ Dense, the team's in-arena DJ.

In 2016, Karp recorded a song titled "Like Riding a Bike", featuring Mike Shinoda from Linkin Park, which is available on SoundCloud.

Karp co-wrote the book Just Can't Get Enough: Toys, Games and Other Stuff from the '80s that Rocked for Abrams Books with Matthew Robinson. Jensen released his memoir, Kanye West Owes Me $300 (and other true stories from a white rapper who ALMOST made it big), detailing the entire experience in June 2016 with Crown Books.

In October 2018, Karp joined the cast of the Kevin and Bean morning show, hosted by Kevin Ryder and Gene "Bean" Baxter on alternative rock station KROQ 106.7 FM in Los Angeles. He had a regular segment called "Get Up on This", based on his podcast. On March 18, 2020, it was announced that the entire morning crew had been let go by KROQ, over the phone at the start of the COVID-19 pandemic. It was reported that the station lost half its audience in the 2 weeks after letting them go as office and car listening fell rapidly across America as the pandemic emerged.

Karp was a writer for WWE Raw for seven months during 2006.

He also appeared on Season 1 of VH1's Barely Famous playing Erin Foster's boyfriend and was seen numerous times on the final season of Candidly Nicole. Karp also appeared on Comedy Central's @midnight. Karp wrote a sketch on The Late Late Show with James Corden called Drop the Mic, where Corden goes head to head battle rapping a different celebrity each installment. After Late Late Show installments with Anne Hathaway, Kevin Hart, David Schwimmer, and Usain Bolt, TBS bought the concept, which aired 31 episodes starting in 2017. Karp was credited as an executive producer for 7 episodes.

Karp has written for Sacha Baron Cohen's Who Is America? The Grammys, The ESPYs, The MTV Movie Awards, The Masked Singer, and the NFL on Fox.