Studied law in the United Kingdom and called to the English Bar as a member of the Honorable Society of the Middle Temple. Lectured law with the Law Tutors and in particular in the subjects of Company Law, Law of Contract, Law of Torts, Equitable Remedies and Executors and Administrators.
Returned to Cyprus and established in 1970 his own practice, having founded the Law Firm of Costas Tsirides & Co. LLC of which he was until the end of 2009, the year of his retirement from the Bar, the managing partner. He is currently the President of the Cyprus Arbitration and Mediation Centre.
Served as President of the Cyprus Licensing Authority, an appointment by the Council of Ministers of Cyprus. Served as Vice-President of the Pancyprian Association of Advocates for 9 years and as a member of the Cyprus Legal Council for 10 years. Also served as President of the Limassol Bar Association for 3 years. Represented the Cyprus Bar Association, as it was then, and later Pancyprian Association of Advocates at various international conferences. Was appointed by the Cyprus Legal Council, in July 1996 as an examiner for the Cyprus Bar Examinations and in October of the same year was also appointed as the coordinator of the said examinations. He has lectured and examined on many subjects including the Law of Contract, the Law of Torts, Criminal Procedure, Civil Procedure and Company Law. He was holding the aforesaid positions until 2002 when he resigned. He was then re-elected as a member of the Legal Council in June 2006 and simultaneously appointed as the co-coordinator of the Cyprus Bar Exams positions he held until his retirement from the profession at the end of 2009.
In 2003 he founded Themis Legal Studies Institute, a non-profit organization for the continuous education of legal professionals, of which he is the President until this day. He is also the President of the Board of Governors of the CTL Eurocollege, Cyprus. He is a member of the Board of Directors and/or legal advisor of numerous companies including several charitable foundations.
In 2012 a special honour was bestowed upon him by His Beatitude Theodoros II, Pope and Patriarch of Alexandria and all Africa; he was appointed as an Officiate of the Patriarchate of Alexandria.
He specializes in Company Law, Contract Law, Construction and Arbitration.
He is married and has two children both married (all of them lawyers including wife and children’s spouses).