|Born||September 10, 1970|
Marx grew up in Hollywood, Florida. He attended Pine Crest School in Fort Lauderdale, Florida. Following graduation, he attended the University of Michigan, where he was a member of the Men's Glee Club. He also holds a juris doctor degree from the Benjamin N. Cardozo School of Law and is a member of the New York State Bar Association, but he does not practice law.
After passing the New York State Bar examination Marx enrolled at the BMI Lehman Engel Musical Theater Workshop in order to meet potential clients in the entertainment industry. Here, he met Robert Lopez who was also in the course.
Together, they created the original concept for Avenue Q and wrote all the show's 21 songs. Avenue Q ran over six years on Broadway and then moved Off-Broadway where it ran another nine years before closing on April 28, 2019.  It continues to have various international productions.
Avenue Q won the 2004 Tony Award for Best Musical. Lopez/Marx's musical score earned them a 2004 Tony Award, and another Tony Award was awarded to Avenue Q bookwriter, Jeff Whitty. The musical's Original Cast Album, on the RCA/Victor label, was nominated for a Grammy Award.
Marx (and his parents) can be seen in the documentary film ShowBusiness: The Road to Broadway, which followed the trajectories of four Tony-nominated musicals from 2004, Avenue Q, Wicked, Taboo and Caroline, or Change. Marx, along with filmmaker Dori Berinstein and actor Alan Cumming, provided the audio commentary for the documentary's DVD.
Lopez and Marx wrote (with Debra Fordham) four songs for a musical episode of the NBC sitcom Scrubs which aired on January 18, 2007. Their song "Everything Comes Down to Poo" was nominated for an Emmy Award. Marx appeared in the episode as a pharmacist, dancing in the background during the song "We're Gonna Miss You Carla". The New York Times reported that the episode "energized a cast and crew that, at a point when most situation comedies are sputtering along or dead, have recently been doing some of their best work." In comparing it to his work on Avenue Q, Marx said: "It took us five years to write Avenue Q ... There were a million readings and previews and staged readings. With this thing, we wrote the songs in a week. They rehearsed for a week. They filmed it in a week, and it was done. It was liberating, and a collaborative effort that created a much more feel-good way of working."
Marx co-wrote the theme song for the Logo Network's animated series Rick & Steve: The Happiest Gay Couple in All the World and contributed additional songs for the show.
Lopez and Marx have written songs for the Disney Channel TV series Bear in the Big Blue House and The Book of Pooh, as well as touring stage musicals for the children's theater company Theaterworks/USA.
Marx was an original collaborator with Lopez and South Park creators Trey Parker and Matt Stone on the 2011 Broadway musical The Book of Mormon. However, Marx departed the show before its premiere. “I worked with them on it and then we split up and made a deal,” Marx told Broadway Journal in 2016. “I don’t want to say more than that except that I’m extremely happy the show has been so successful!”
Marx collaborated with Mervyn Warren on a song called "You Have More Friends Than You Know" for the It Gets Better organization. The song was featured on the television program Glee on April 18, 2013. Marx recorded his version of the song and made it available for download with a portion of the proceeds going to support The Trevor Project. Marx has also made a karaoke version of the song available for those who want to perform their own version and help spread the song's message, and has featured other versions on the song's website.
Marx has also written the book How To Win A High School Election.
- "'Avenue Q' To Exit 15-Year New York Run: Closing Date Announced" December 11, 2018". Deadline. December 11, 2018. Retrieved 2020-12-20.
- "Stage Stars Nab 2007 Emmy Nominations, Broadway.com Buzz". Broadway.com. 2012-08-01. Retrieved 2013-12-05.
- The New York Times, Diagnosis: Acute Case of Broadway Melodium Tremens, Tuesday, January 16, 2007.
- "Jeff Marx sings Kwanzaa song "White Kwanzaa" on "D.L. Hughley Breaks The News" 12/13/08". YouTube. 2008-12-13. Archived from the original on 2021-12-12. Retrieved 2013-12-05.
- Boroff, Philip (June 6, 2016). "THE BOOK OF MORMON'S EARLY-DAY WRITER". Broadway Journal. Retrieved September 10, 2022.
- Hetrick, Adam (February 20, 2015). "Streets Hit the Stage in Home Street Home, New Musical by Avenue Q Tony Winner Jeff Marx, Premiering Tonight". Playbill. Retrieved September 10, 2022.
- The Official Avenue Q website
- Avenue Q merchandise: cd, program, posters, etc.
- Jeff Marx at the Internet Broadway Database
- Production: Avenue Q - Working in the Theatre Seminar video at American Theatre Wing.org, September 2003
- The Official website for the song "You Have More Friends Than You Know"
- Marx's book How To Win A High School Election Online
- Jeff Marx interviewed on a free podcast from Masterworks Broadway
- Jeff Marx at IMDb