Cusack was born to Irish speaking parents, in the parish of Carron on the eastern fringe of the Burren, County Clare, in 1847, during the Great Irish Famine.
Cusack became a national school teacher, and after teaching in various parts of Ireland became a professor in 1874 in Blackrock College, then known as the French College.
In 1877, Cusack established his own Civil Service Academy, 'Cusack's Academy' in Dublin which proved successful in preparing pupils for the civil service examinations.

A romantic nationalist, Cusack was also "reputed" to have been associated with the Fenian movement.
He was active in the Gaelic revival: a member of the Society for the Preservation of the Irish Language which was founded in 1876, and later the Gaelic League who in 1879 broke away from the Society.
Also in 1879, Cusack met Pat Nally, who was a member of the Irish Republican Brotherhood and a leading nationalist and athlete.
Cusack found that Nally's views on the influence of British landlordism on Irish athletics were the same as his.
Cusack would recall how both Nally and himself while walking through the Phoenix Park in Dublin seeing only a handful of people playing sports in the park so depressed them that they agreed it was time to "make an effort to preserve the physical strength of [their] race."
Nally organised a National Athletics Sports meeting in County Mayo in September 1879 which was a success, with Cusack organising a similar event which was open to 'artisans' in Dublin the following April.

On 1 November 1884, Cusack together with Maurice Davin, of Carrick-on-Suir, County Tipperary, called a meeting in Hayes' Commercial Hotel, Thurles, County Tipperary, and founded the Gaelic Athletic Association (GAA).
Davin was elected president and Cusack became its first secretary.
Later, Archbishop Thomas William Croke (28 May 1824 – 22 July 1902), Archbishop of Cashel & Emly, Michael Davitt and Charles Stewart Parnell became patrons.
Cusack also became involved in the Irish language movement, founding  The Celtic Times, a weekly newspaper which focused on 'native games' and Irish culture.

Cusack died in Dublin on 27 November 1906 at the age of 59.
Cusack was born to Irish speaking parents, in the parish of Carron on the eastern fringe of the Burren, County Clare, in 1847, during the Great Irish Famine. Cusack became a national school teacher, and after teaching in various parts of Ireland became a professor in 1874 in Blackrock College, then known as the French College. In 1877, Cusack established his own Civil Service Academy, 'Cusack's Academy' in Dublin which proved successful in preparing pupils for the civil service examinations.
A romantic nationalist, Cusack was also "reputed" to have been associated with the Fenian movement. He was active in the Gaelic revival: a member of the Society for the Preservation of the Irish Language which was founded in 1876, and later the Gaelic League who in 1879 broke away from the Society. Also in 1879, Cusack met Pat Nally, who was a member of the Irish Republican Brotherhood and a leading nationalist and athlete. Cusack found that Nally's views on the influence of British landlordism on Irish athletics were the same as his. Cusack would recall how both Nally and himself while walking through the Phoenix Park in Dublin seeing only a handful of people playing sports in the park so depressed them that they agreed it was time to "make an effort to preserve the physical strength of [their] race." Nally organised a National Athletics Sports meeting in County Mayo in September 1879 which was a success, with Cusack organising a similar event which was open to 'artisans' in Dublin the following April.
On 1 November 1884, Cusack together with Maurice Davin, of Carrick-on-Suir, County Tipperary, called a meeting in Hayes' Commercial Hotel, Thurles, County Tipperary, and founded the Gaelic Athletic Association (GAA). Davin was elected president and Cusack became its first secretary. Later, Archbishop Thomas William Croke (28 May 1824 – 22 July 1902), Archbishop of Cashel & Emly, Michael Davitt and Charles Stewart Parnell became patrons. Cusack also became involved in the Irish language movement, founding  The Celtic Times, a weekly newspaper which focused on 'native games' and Irish culture.
Cusack died in Dublin on 27 November 1906 at the age of 59.
Michael Cusack