He was called to the Bar of England &Wales in 1993;and to the Ugandan Bar in 2000. In 2010 he was appointed as Commissioner for Oaths and Notary Public. David worked in the chambers of John Mathew QC at 5 Paper Buildings in the United Kingdom where he handled criminal litigation. He returned to Uganda in 1998 and worked with Mugerwa & Masembe, Advocates up to September 2003.
In October 2003, David set up A.F. Mpanga, Advocates now locally and internationally acknowledged as a leading law firm in Uganda and a member of the Bowman Gilfillan Africa Group. He has cultivated a specialization in financial institutions law, international commercial transactions, mergers and acquisitions as well as oil & gas. He also has experience handling public interest cases in the Constitutional Court and has appeared in a number of landmark cases.
He is the Attorney General and Minister of Local Government in the Buganda Government, a cultural institution headed by the Kabaka of Buganda.
David is an avid reader of history, economics and politics. He is the writer of a popular weekly column in the Saturday Monitor, in which he advocates for constitutionalism, the rule of law, personal responsibility and basic common sense.