James Macmahon PC (Ire) (20 April 1865 – 1 May 1954) was an Irish civil servant and businessman.Macmahon was born in Belfast and raised Catholic. He was educated at St Patrick's College, Armagh and Blackrock College in Dublin. He joined the Irish Post Office, being promoted to Assistant Secretary in 1913 and Secretary in 1916. In 1918, he became Under-Secretary for Ireland.There was a need to decode the coded messages sent to the Dublin Castle administration from London. Macmahon appointed GPO worker Nancy O'Brien due to her dedication and purported lack of interest in politics. However, O'Brien was a second cousin of Michael Collins, and each day, between 2:30 and 3:30, she would pass any salient information she acquired to either Joe McGrath, Liam Tobin or Desmond FitzGerald. Wikipedia
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