David Ellefson

David Warren Dave Ellefson is an American bassist and cofounding member of the American thrash metal band Megadeth from 1983 to 2002 and again from 2010. He has also been referred to as Junior to differentiate him from his bandmate Dave Mustaine but does not go by this name professionally. 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.

Ellefson was born November 12, 1964 in Jackson, Minnesota. He is of Norwegian, German and English descent. He became an accomplished bassist and honed his songwriting skills while leading several of his own bands through the club scene of North Americas Midwest region before relocating to Los Angeles.

Source: Wikipedia