To construct a timeline of significant events in Dr. Eamonn O’Sullivan’s life time, particularly relevant to occupational therapy practice.

Background: Documenting history in health care practice such as occupational therapy has become increasingly important to highlight the philosophical foundations of the profession. Much is known about pioneering occupational therapists in other countries; however the contribution of Dr. Eamonn O’Sullivan (1897-1966) to date has been completely unrecognised. Dr. O’Sullivan was one of the philosophical founders of modern occupational therapy in Ireland and worldwide publishing the first known occupational therapy book of its kind in Europe, ‘Textbook of Occupational Therapy with Chief Reference to Psychological Medicine’ in 1955. Objective: To construct timeline and narrative account of Dr. O’Sullivan’s lifetime with particular emphasis on significant events, relevant to occupational therapy describing practice and development during the twentieth century. Methods: Historical research of inquiry relevant to Dr. O’Sullivan using primary sources of; personal biographical transcripts, records of events, photographs and secondary data sources of; newspaper articles, published books, and internet searches. Results: Comprehensive biographical account of Dr. O’Sullivan was obtained from data sources. Dr. O’Sullivan is widely acknowledged for his contribution to Gaelic Athletic Association. This research emphasises his contribution to psychiatry, mental health practice and his involvement in the evolution of occupational therapy practice during his 37 years working at Killarney Mental Hospital. Conclusion: Evidence based research has highlighted the importance and value of occupational therapy. A comprehensive and detailed biographical account of Dr. O’Sullivan and key events are presented in chronological order. The analysis presented explores influences on Dr. O’Sullivan and details his contribution to occupational therapy.