He attended St Mary's College, Dublin before beginning medical school at RCSI in 1941.
In 1956, Lynch married Dr. Sheila O'Donovan, a medical graduate of University College Cork.
[5] After graduating from RCSI in 1946, Lynch completed his internship at the Richmond Surgical Hospital, where he worked for Professor Leonard Abrahamson.
Lynch then worked at St Patrick's University Hospital where he obtained membership of the Royal College of Physicians of Ireland and earned a diploma in psychological medicine.
In 1952, Lynch spent a year training at the Maudsley Hospital Institute of Psychiatry.