Question: Lawrence Vavra had an association with the DJ born in what city?

Context paragraphs:
Leinender: Leinender is a musician, record producer and DJ born in Bordeaux, France.  He has been active since 2004, and is mostly known for his work in trance music.  He is also rated as one of the top DJs in France on the web site The DJ List.

Mr. Len: Mr. Len (Leonard "Lenny" Smythe) is a hip hop DJ born in the Bronx, New York.  He grew up in Hillside, NJ.  He was a member, with Bigg Jus and El-P, of the underground hip hop trio Company Flow, which disbanded in the late 1990s.  His debut full-length, released on Matador Records in 2001, included guest spots by Jean Grae, Chubb Rock, and Mr. Live.  Later he formed a group with Kimani Rogers from The Masterminds named Roosevelt Franklin.  He also collaborated with Handsome Boy Modeling School member Prince Paul to produce the faux-doo wop group The Dix.

Steve Lawler: Steve Lawler is a British house music producer and DJ born in Birmingham, England he is a five time DJ Awards winner and has held residences at many popular dance clubs such as Space, The End and Twilo.  Because of his successful performances at Space in Ibiza, he was nicknamed "King of Space".  Lawler has released several mix albums and is especially well known for his "Lights Out" series featured on Boxed.  He currently runs the record label VIVa MUSiC.  He also founded the now defunct Harlem Records.

DJ Format: Matt Ford, better known as DJ Format (a near-inversion of his birth name), is a hip hop DJ born in Southampton, England who lives in Brighton.  He collaborates frequently with Abdominal on the album "Music For the Mature B-Boy" and with Abdominal and fellow Canadian rapper D-Sisive on the second full album "If You Can't Join 'Em… Beat 'Em", as well as with Akil and Chali 2na from Jurassic 5.

Robbie Rivera: Roberto "Robbie" Rivera (born 1973) is a prolific house music producer and DJ born in Puerto Rico.  He has an extensive catalog of original productions and remixes to his credit, ranging from tribal to progressive house, as well as incorporating garage and Latin elements.  He and his wife Mónica Olabarrieta have homes in Miami and Ibiza.  On October 28, 2009, "DJ Magazine" announced the results of their annual Top 100 DJ Poll, with Rivera placing number 95.

James Davis (musician): James Davis is the British house and techno music producer and DJ born in Portsmouth, England.  As well as a solo artist James is also one half of the act Grafiti.

Lawrence Vavra: Lawrence Vavra (also known as LV) was born November 15, 1977 in Los Angeles and is an American music manager known for his association with DJ AM, Air (French band), Blink-182, Travis Barker, The Transplants, and Dance Artists, Infected Mushroom and Steve Aoki and Deorro.  Vavra graduated from UCLA undergrad in 1999 and Hastings Law School in 2002 where he received his Juris Doctorate.  After graduation, Vavra created the San Francisco based company Vintage415 with various business partners and currently owns several Bay Area Restaurants and Bars including Mamacita, Umami, The Ambassador, Double Dutch, and The Aventine.

John Gibbons (DJ): John Gibbons is a record producer, remixer, and DJ born in Ireland and now based in London, UK.  He is best known for his 2016 single 'Would I Lie to You', which remixes the original song by Charles & Eddie.

DJ AM: DJ AM (born Adam Michael Goldstein; March 30, 1973 – August 28, 2009) was an American disc jockey (DJ).  Goldstein was born in Philadelphia, Pennsylvania.  He became obsessed with deejaying as a child after watching a performance of "Rockit" by Herbie Hancock.  Goldstein developed a drug addiction as a teenager and was sent to the controversial rehabilitation center Straight, Incorporated.  His drug problems became worse after leaving the center, four years in his early twenties were spent with him focusing solely on drug use and deejaying.  After a failed suicide attempt in 1997, Goldstein became sober and went on to sponsor other addicts through Alcoholics Anonymous.

DJ Harvey: DJ Harvey, (born Harvey Bassett), is a DJ born in London, England.  He was an early exponent of the US disco/garage/house sound in the UK.

Supporting paragraphs: Lawrence Vavra DJ AM
Answer: Philadelphia, Pennsylvania