An American musician. He was vocalist and bass guitar player with Quicksilver Messenger Service, Jefferson Airplane and Jefferson Starship.

Born in Cincinnati, Ohio, Freiberg began his career as a coffee house folk musician. For a while he shared a house in Venice, California, with other future folk-rockers David Crosby and Paul Kantner. Janis Joplin was also one of his roommates.

In the mid-1960s, already in his late twenties, he founded Quicksilver Messenger Service with John Cipollina. In 1972, he joined Jefferson Airplane for the tour that promoted their final studio album, Long John Silver, and appeared on their final live album Thirty Seconds Over Winterland. The remnants of the band — minus lead guitarist Jorma Kaukonen and bassist Jack Casady, who had formed their own band, Hot Tuna — eventually evolved into Jefferson Starship and Freiberg remained with this group until 1984 when he quit following the departure of Kantner.

After a two decade hiatus, Freiberg rejoined Kantner in Jefferson Starship for their 2005 tour, which was billed as The Jefferson Family Galactic Reunion, and as of 2008 has officially rejoined the group and appears on the 2008 release Jefferson's Tree of Liberty which is the first Jefferson Starship release to feature Frieberg since 1984's Nuclear Furniture.