OPIO

From Discogs:

Opio (born: 1975) is a West-Coast-based rapper best known for his releases as a member of Hieroglyphics and Souls Of Mischief.

From Lastfm:

Opio Lindsey, known by his stage name, Opio, (born: 1975), is a member of the four-member, Oakland-based underground rap group, Souls of Mischief, and the eight-member, underground hip hop collective, Hieroglyphics.

Opio has appeared on all four Souls of Mischief albums, [all three] Hieroglyphics studio albums, and released his solo debut, Triangulation Station, in February, 2005 on the Hieroglyphics' own independent label, Hieroglyphics Imperium Recordings.One of his songs was on a heirocast episode called "Grassy Knoll" where he raps along with Planet Asia. - Wikipedia

From Wikipedia:

Opio Lindsey, known by his stage name, Opio, (born: 1975[citation needed]), is a member of the four-member, Oakland-based underground hip hop group, Souls of Mischief, and the eight-member, underground hip hop collective, Hieroglyphics.

Opio has appeared on all four Souls of Mischief albums, both Hieroglyphics studio albums, and released his solo debut, Triangulation Station, in February, 2005 on the Hieroglyphics' own independent label, Hieroglyphics Imperium Recordings.

Opio's second solo album, Vulture's Wisdom, Volume 1, was released on July 15, 2008 on Hieroglyphics Imperium Recordings as well.