Jason Jonathan Popson (born November 2, 1971) is an American vocalist and rapper for metal band Mushroomhead taking the stage name J Mann. Prior to his initial departure from the band he was identified by his face paint, which was based on the film Dead Presidents. Since 2014, he has worn a mask like the rest of the band.
Popson left Mushroomhead in mid-2004 due to being overworked and his father's terminal illness. Though it was previously confirmed that Popson would be featured on Mushroomhead's new studio album Beautiful Stories for Ugly Children, it was revealed in an interview with Mushroomhead's lead singer Jeffrey Nothing that he would no longer be on the album. No specific reason was given. Popson began making periodic stage appearances during Mushroomhead songs some time around 2008 and has since performed with them numerous times, including filling in for an entire show in 2011 when Waylon Reavis was sick and unable to perform. As of 2013 J Mann announced on his personal Facebook that he has returned to the band.
Popson is an actor and musician who has been involved with the industry since the early 1990s. It has been hinted lyrically and in vague interviews that he was raised by a single parent—his mother—following the departure of his father from his life at a young age. However, Popson later regained a relationship with his father, which played a pivotal role in him leaving Mushroomhead.

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