He played both hurling and Gaelic football with the New Ross Geraldines and with the Wexford senior inter-county teams in both codes in the 1900s and 1910s.
[3] Together with his team mate and contemporary Seán O'Kennedy, he is one of two Wexford players to have won All-Ireland medals in both hurling and football.
[citation needed] Three years after this, Mackey was a star player on the Wexford senior football team.
[citation needed] Mackey captured a second Leinster medal in 1914 as Wexford beat Louth in the provincial decider.
On that occasion Mackey, along with his teammate Seán O'Kennedy, jointly became the fourth players in history to have All-Ireland medals in both hurling and football.
[citation needed] Wexford continued their winning ways in 1916 with Mackey collecting a fourth successive Leinster football title.
Kildare were defeated on that occasion, however, Mackey ended up on the losing side in the Leinster hurling decider.
At provincial level, Wexford defeated Louth by four points and Mackey won his sixth consecutive Leinster football medal.
[citation needed] A seventh Leinster football title in-a-row proved beyond this Wexford team while the hurlers also gave up their provincial crown.
[citation needed] Mackey, who married in 1923 and had three children, died in January 1948 and was buried in St Stephen's cemetery, New Ross.