Illingworth was one of the seven 'heptarchs' of the Dawn and Dusk Club of which Australian writer Henry Lawson and other notable Sydney bohemians were members around 1898.
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Illingworth did some architectural sculpture for buildings in Sydney, and a large number of portrait busts of notable men of his time such as Australia's first Prime Minister Sir Edmund Barton and 'Father of Federation' Sir Henry Parkes.
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At Papawai pa, New Zealand, he erected a monument in 1911, to the memory of Hamuera Tamahau Mahupuku, a distinguished chief of Ngati-Kahungunu.
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