Louis was a senior partner at PWC's Assurance practice in Windhoek until he reached the firm's mandatory retirement age. He has provided external audit services to major clients in Namibia. Louis previously served on the Institute of Chartered Accountants in Namibia (ICAN) Council.
He was also a member of ICAN’s technical sub-committee, dealing with auditing and accounting statements in Namibia. He previously served as a member of the Public Accountants' and Auditors' Board.