Derek Ogg was appointed Crown Counsel in 2007 at Senior level. He was further promoted to the second most senior post as Assistant Principal Advocate Depute in 2009. Additionally he was appointed as Head of National Sexual Crimes Unit, a groundbreaking new High Court prosecution Division in Crown Office made up of 9 senior prosecutors and 2 senior indicters. They mark, investigate and prosecute all serious and sensitive sex related crime in the High Court. He also conducts serious and sensitive conviction Appeals before the Court of criminal Appeal and the Supreme Court for the Crown.