Richard Alfonso Martinez (born June 18, 1961), better known by the stage name Oz Fox, is the lead guitarist of the Christian glam metal band Stryper.

[1] He joined the LA guitarists trend of heavily incorporating tapping, sweeping, string skipping and wild tremolo use along with peers such as George Lynch, Warren DeMartini, Jake E. Lee, Mick Mars, and Tony Palacios.

He later took up the main vocal duties for a period of four months in 1992 after founding member Michael Sweet decided to leave the band and pursue a solo career.

SinDizzy, which released an album in 1998 titled He's Not Dead, included former Stryper bassist Tim Gaines, drummer John Bocanegra and LA guitarist Bobby MacNeil.

SinDizzy would be put on hiatus however due to Fox and Gaines being asked to rejoin Stryper for their reunion in 2003 in support of the album 7 after the widespread acceptance and excitement generated by the first 'Stryper Expo'.

Though Gaines would elect to leave the band, Fox, together with brothers Robert and Michael Sweet and newcomer bassist Tracy Ferrie and later Perry Richardson, is still recording and touring with the group.