David Ellefson is a bassist and founding member of the American thrash metal band Megadeth. He has also been referred to as “Junior” to differentiate him from Dave Mustaine. Ellefson currently resides in Scottsdale, Arizona. In addition to playing bass guitar in Megadeth, Ellefson also has various side projects which include Temple of Brutality, F5, and Killing Machine.
Other than guitarist, vocalist, and primary lyricist Dave Mustaine, Ellefson was the only constant member of Megadeth from the time of their establishment in 1983 to the group’s dissolution in 2002 (Mustaine subsequently reformed Megadeth without Ellefson in 2004). To differentiate between the two Daves, Mustaine referred to Ellefson as “Dave Junior”, which was often shortened to “Junior”. He appeared on every album and tour from 1985’s record Killing Is My Business… And Business Is Good! up until 2002’s Rude Awakening. Ellefson’s original playing style involved using his fingers; however, as Megadeth progressed and the music became more complex, he tended to prefer playing with a pick/plectrum. Ellefson was credited with some Megadeth songs, including “Family Tree” from 1994’s Youthanasia (in the 2004 remastered collection of the CD however, the track is credited to Mustaine, Ellefson, Friedman, Menza, but Dave Mustaine credited the Rust in Peace-era line-up with the entire Youthanasia album as a tribute to the band’s success at the time of the record’s initial release).