Brown had been with the firm less than six months, having joined in October last year along with Grant Thomson who continues in his senior position in its private client and charities team.
Prior to joining Cornelian, Brown worked as an equity income fund manager at Ignis, but he left the firm in March 2012 after the asset manager transferred the management of his UK Equity Income fund to Graham Ashby.
Brown is not the first to leave Cornelian after a short period; Jamie Daniels left his role as associate director, investment manager, private clients and charities after eight months in September 2011.