[7] Writing on the rehearsal of a play entitled The Enthusiast which he had watched in 1905, Sam Hanna Bell concludes that Morrow's acting as lead character, James McKinstry, was "the one weak spot in the piece.
[10] Morrow showed An April Morning at Aonach na Nodlag in the Rotunda in 1909 alongside Wiliam Leech, William Orpen, George Russell and a host of well known Irish Artists.
[16] In 1908 Morrow and his brothers held an exhibition at the family business of 15 D'Olier Street in Dublin which consisted of seventy-three works, including several watercolours by Jack.
[1][17] By 1912 Jack Morrow had become a member of the Wolfe Tone and United Irishmen Memorial Association Committee which was a radical organisation and a legal front for the Irish Republican Brotherhood.
[21][22] Morrow returned to political cartooning in 1917, but on 6 September 1918 he was arrested in possession of seditious postcards and secret Government documents at his home in D'Olier Street.
[3] In February he was sentenced to seven months in Mountjoy Prison with hard labour, under the Defence of the Realm Act, for unauthorised possession of confidential government documents.