Adrian Johnson played by Cyrus Farmer is one of the African American COs on the HBO drama Oz. He first appears as one of the several African American COs to work in Emerald City under the management of Martin Querns. He is one of the few COs seen who openly shows favoritism towards the African American inmates throughout the series. After Querns is fired, Johnson works mainly in Unit B, occassionally seen in Em City and the library. Later when a city mayor comes to Oz for assisting the Ku Klux Klan in a 1963 killing, Johnson goes along with Governor Devlin's African American assistant Perry Loftus in causing a cover-up murder of the mayor who blackmails Devlin for a pardon. The cover-up gets complicated to the point that Warden Leo Glynn discovers Johnson's role where he then pays an inmate Lionel Kelsch to murder him. As Glynn is murdered, Johnson rats out the governor's assistant and goes home fre An African American (also Afro-American, Black American, or simply black), is a member of an ethnic group in the United States whose ancestors, usually in predominant part, were indigenous to Africa. ... HBO logo HBO (Home Box Office) is a premium cable television network. ... Oz was the first one-hour dramatic television series to be produced by HBO. The show, which aired for six seasons (1997-2003), is set in a maximum-security prison in the state of New York. ... An African American (also Afro-American, Black American, or simply black), is a member of an ethnic group in the United States whose ancestors, usually in predominant part, were indigenous to Africa. ... Spoiler warning: Martin Querns is played by Reg E. Cathey. ... An African American (also Afro-American, Black American, or simply black), is a member of an ethnic group in the United States whose ancestors, usually in predominant part, were indigenous to Africa. ... Members of the second Ku Klux Klan at a rally during the 1920s. ... 1963 (MCMLXIII) was a common year starting on Tuesday (the link is to a full 1963 calendar). ... An African American (also Afro-American, Black American, or simply black), is a member of an ethnic group in the United States whose ancestors, usually in predominant part, were indigenous to Africa. ... Leo Glynn (played by Ernie Hudson) is the warden of the oswald state correctional facility on the HBO drama Oz. ...