Like his grandfather, aunt, and uncles, Stewart became a sculptor, specialising in portrait busts.
He exhibited with the Royal Hibernian Academy from 1868 to 1873, when he started referring to himself as Thomas Stewart Kirk.
[2] One of his most notable works is the 1868 bust of the president of the Royal College of Surgeons in Ireland, George Hornidge Porter.
[1] Other portrait busts by Kirk are John Skipton Mulvany and Dr James Stannus Hughes, both from 1871.
[2][3] Kirk left Dublin in 1879, and died in Kansas City, United States on 8 October 1879.