Trivia

His parents, Judith Lois (Cohen) and Thomas William Black, who were rocket scientists, divorced when Black was 10. His mother, Judith Love Cohen, worked on the Hubble space telescope.

Originally met his wife in high school. They both attended Crossroads, a private school. They met again 15 years after they graduated high school at a friend's birthday party.

One of his closest friends is Dave Grohl.

One half of the rock band Tenacious D alongside friend and collaborator Kyle Gass.

Wife, Tanya Haden, is a cellist. She is the daughter of jazz great Charlie Haden.

His wife is a triplet. Her sisters, Petra Haden and Rachel Haden, also musicians, used to be members of the band "That Dog". Petra was also a former member of the band The Decemberists. Their brother is Josh Haden.

Became a father for the first time at age 36 when his wife Tanya Haden gave birth to their son Samuel Jason Black on June 10, 2006.

Despite poking fun at the genre, he is actually a very knowledgeable fan of hard rock/heavy metal music from the 1970s and 1980s. He even appears as part of Tenacious D in Ronnie James Dio's music video for the song "Push".

Is a member of, what the media refers to as the Frat Pack along with Will Ferrell, Ben Stiller, Vince Vaughn, Owen Wilson, Steve Carell and Luke Wilson. The Frat Pack name is a reference to the film Old School (2003), which features Vaughn, Ferrell and Wilson because of the wide number of films featuring the seven actors. Black's "Frat Pack" films include The Cable Guy (1996), Envy (2004) and Anchorman: The Legend of Ron Burgundy (2004).

Often competes for the same roles with Philip Seymour Hoffman. On the Blu-ray audio commentary for School of Rock (2003), he jokingly calls Hoffman "my nemesis". He was later considered for the role of Freddy Lounds in Red Dragon (2002), which went to Philip Seymour Hoffman.

Said he considers The Who to be the greatest band of all time, explaining that "they were the first ones to ever rock HARD... the recklessness, the deliciousness!".

Sang backup vocals for the songs in Bob Roberts (1992).

Filmed a television pilot called Heat Vision and Jack (1999) co-starring Ron Silver, and Christine Taylor, and directed by Ben Stiller. The series was a parody of Knight Rider (1982), as well as other action adventure series, and featured a talking motorcycle voiced by Owen Wilson.

On the Blu-ray audio commentary for School of Rock (2003), he calls himself "the Pied Piper of rock music" for leading the prep school students astray only to empower them.

Is good friends with Tim Robbins, Cesar Gonzalez and Will Smith.

Appeared in a parody of the Council of Elrond scene shown during the MTV Movie Awards. The Lord of the Rings director Sir Peter Jackson later cast him in King Kong (2005).

Discovered he could act when he played a game of Freeze after a Passover seder.

He was awarded a Star on the Hollywood Walk of Fame at 6144 Hollywood Boulevard in Hollywood, California on September 18, 2018. Director Richard Linklater and Mike White were guest speakers at the ceremony.

Starred in a management training film "Manager of the Year - Effective Listening" (1987) as a teenager who tells his father that the family car has been stolen.

Revealed on an Australian late night variety show that his favorite KISS rock song is "I Love it Loud" (1982) where he began singing parodied lyrics to the first verse.

Was considered for the role of Hal Jordan / Green Lantern in an unproduced screenplay by Robert Smigel. The idea was ultimately scrapped by Warner Brothers for a less comedic screenplay.

He and his wife eloped after dating less than a year. They were married in Big Sur, California by the same minister who performed Shane Stanley and Val Barri's ceremony (2005).

Attended Crossroads High School for the Arts and Sciences.

Mother Judith Love Cohen, a NASA engineer, helped create the abort-guidance system that rescued the Apollo 13 astronauts.

Jack's paternal grandfather, Thomas Walter Black, had Scottish, Northern Irish, and English, ancestry, partly by way of Canada, and Jack's paternal grandmother, Gladys Rose Zachman, was from an ethnic German family that had emigrated from Romania and Ukraine. Jack's maternal grandparents, Morris Cohen and Sarah Roisman, were Russian Jewish immigrants. Jack's father converted to Judaism when he married Jack's mother.

Was engaged to actor/comedian/producer Laura Kightlinger and was with her from 1997 until 2005.

Hosted the MTV Movie Awards along with Sarah Michelle Gellar (2002).

Attended Poseidon School in Santa Monica, California.

Mentioned in the song "High School Never Ends" by the rock band Bowling for Soup, as "the clown".

Auditioned for the role of Cubby Barnes in Ransom (1996), which went to Donnie Wahlberg.

Had his gall bladder removed.

He and Kirsten Dunst were considered for Land of the Lost (2009). Black was in Jumanji: Welcome to the Jungle (2017) and Dunst was in Jumanji (1995).

He and Mike White formed a production company called Black and White.

Done commentary for a professional wrestling event.

Born on the same date as Jason Priestley.