O'Connor was born in Worcester, Mass and died in Dublin. For a time he was in the London studio of the painter, John Singer Sargent, and later worked for the architects, McKim, Mead and White in America and with the sculptor Daniel Chester French. Settling in Paris in the early years of the 20th century, he exhibited annually at the Paris Salon. In 1906 he was the first foreign sculptor to win the Second Class medal for his statue of General Henry Ware Lawton, now in Garfield Park in Indianapolis. In 1928 he achieved a similar distinction by being awarded the Gold Medal for his Tristan and Iseult, a marble group now in the Brooklyn Museum.
^Homan Potterton, Andrew O'Connor 1874-1941, Catalogue of an Exhibition at Trinity College, Dublin, 1974; Doris Flodin Soderman, The Sculptors O'Connor: Andrew Sr, 1847-1924, Andrew Jr, 1874-1941 (Worcester, Mass, 1995).