Kariisa took over NBS Television from its founder, Nathan Igeme Nabeeta, in 2008 as CEO and grew it into Next Media Services, a multimedia company that runs three television stations (NBS Television, Sanyuka TV & Salam TV), a radio station (NXT Radio - formerly Jazz FM) in 2018, online news portal (Nile Post), digital communications agency and productions houses (Next Communications & Next Production).