Jonathan Jacob Walker (born September 17, 1985) is an American musician. Formerly the bassist of Panic! at the Disco, Walker was also lead guitarist and occasional lead vocalist of the The Young Veins, now on indefinite hiatus. As of 2011, he is pursuing a solo career as a folk-pop artist. He announced on the 16th of June 2013 Twitter that he is having a baby.
Born in Chicago, Illinois, Walker first became known in the Chicago scene in 2003 as the replacement bass player for 504Plan. The band broke up soon after he joined, and Walker then toured with The Academy Is... as a guitar tech and a videographer. Walker joined Panic! in May 2006, replacing former bassist Brent Wilson. At the time he joined, he was (at age 20) the oldest of the band members. Walker was with Panic! when they won the video of the year award at the 2006 MTV Video Music Awards for their song "I Write Sins Not Tragedies", although he had not recorded the song with the band nor did he appear in the video. He co-wrote and released one studio album with the band, Pretty. Odd., and one live album, ...Live in Chicago.