For solicitors, section 59 of the Solicitors Act 1954 prevents non-solicitors from being shareholders in law firms. For barristers, only sole practitioner is allowed as a legal form. This implies that board of directors are licensed professionals.Additional information:Solicitors & barristers full report by the Competition Authority (December 2006), para.5.5, 5.148 and 5.112:https://www.ccpc.ie/business/wp-content/uploads/sites/3/2017/03/Solicitors-and-barristers-full-report.pdf