Erna began his professional career in the Boston garage band Jared, which produced its single "Space Traveler" in 1980. He was the original drummer for the punk/new wave band The Blackjacks and drummed for the Boston based rock band The Outlets.
In 1996, Erna, The Outlets' guitarist Rick Barton, singer Mike McColgan, and bassist Ken Casey formed the Dropkick Murphys. Erna would appear on the band's earliest 7" records, compilation appearances and their Boys on the Docks EP before leaving the band in 1997 shortly before the recording of their debut album, Do or Die. Erna was replaced by their current drummer Matt Kelly.
In 2002, Erna along with Mike McColgan formed the punk band Street Dogs. Erna recorded the band's debut album, 2003's Savin Hill, and appeared in the music video for the album's title track before leaving the band that same year.
- Space Traveler 7" (1980)
The Boston Bootleg varulven records
- Basic Blackjacks (1984)
- Mr. Beautiful Presents All Hard (compilation) (1985)
- Rock Turns To Stone (compilation) (1988)
Dress in black (1985)
- Dropkick Murphys / Ducky Boys 7" (1996)
- I've Got My Friends-Boston/San Francisco Split CD
- Runt of the Litter, Vol. 2 (compilation) (1996)
- TKO Records Presents: The 1998 Street Punk Title Bout 7" (1997)
- Tattoos and Scally Caps 7" (1997)
- Fire and Brimstone 7" (1997)
- Boys on the Docks (1997)
- The Bruisers / Dropkick Murphys 7" (1997)
- Give 'Em the Boot (compilation) (1997)
- Oi! Skampilation Vol. 3 (compilation) (1997)
- The Early Years (1998)
- The Singles Collection, Volume 1 (2000)
- Demo (2002)
- Savin Hill (2003)
- Street Dogs / The Dents - Round One EP (2004)
- Eat This! (2003)
- No More Idols / Today And Tomorrow 7" (2004)
- "Cellars by Starlight | Working-class city rockers". Bostonphoenix.com. Archived from the original on 2012-02-06. Retrieved 2012-09-01.
- "BandToBand.com". BandToBand.com. Retrieved 2012-09-01.
- "Jeff Erna".