Denis is a practising solicitor with more than 40 years experience who specialises in medical negligence litigation.

Denis studied law at University College Cork, Trinity College Dublin and the Law School of The Incorporated Law Society of Ireland.

In addition to his qualification as a solicitor, Denis holds a Bachelor of Civil Law degree (B.C.L), a Masters of Laws degree (LL.M) and a Masters of Letters (M.Litt) in Law.