Cliff Gardner has had a post-conviction practice specializing in appellate and habeas corpus representation since 1981. He has argued at all levels of the state and federal court system, including 15 cases in the California Supreme Court and three cases in the United States Supreme Court. He has successfully represented death row clients in Idaho, Montana, and California, and lectures nationally about appellate and habeas representation. He has been an Adjunct Professor at Boalt Law School since 2008. In 2000, he authored Proposition 36, a statewide initiative enacted by the California electorate, precluding the state from incarcerating non-violent drug possession offenders.