Painting since the early 1950s, he has held his own one-man exhibition of 42 paintings in the James Gallery as well as exhibiting his work regularly at the Wexford Opera Festival including a sell-out of all his pictures on show. Liam is a much sought after artist for exhibitions in Belfast, Galway, Cork and at foreign exhibitions including across the water in Britain.

In 1978 Liam Treacy went full-time as a professional painter, a courageous step, and the fact that he has made a career of it is testimony to the sheer quality of his work as an artist. His paintings have been sold for up to £3,500.

Before going professional, he worked in the former Brennan's Bakery in Arklow, which used his skill as an artist to paint the lettering on its vans.

For many years he was art teacher for night-time classes in Arklow Community College; Abbey Community College, Wicklow; and at Shelton open detention centre at classes for the prisoners.