Some of the first settlers of this family name or its variants were: John Cosins who settled in Maryland in 1683; Richard Cousin settled in Grenada in 1774; Edward Cousins settled in Maryland in 1774; George Cousins settled in Massachusetts in 1635.
Ó Snodaigh is the brother of the three Ó Snodaigh brothers in the band Kíla and is the son of the writer and publisher Pádraig Ó Snodaigh and the sculptor Clioḋna Cussen from Newcastlewest, County Limerick.
In 1916, Cussen had been made a trustee of the State Library of Victoria, the Victorian Museum and the National Gallery of Victoria, then run by a single board of trustees, and in 1928 he was made President of the board.
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Cussen was elected the President of the Melbourne Cricket Club in 1907, a position he would hold until his death.
Lederer wrote the foreword to Words at Play: Quips, Quirks and Oddities, by O.V. Michaelsen (Sterling Publishing Company, New York, 1998), and to Weather Facts and Fun (2009), a children's book on weather, co-written by Josh Judge and Kathe Cussen and published by SciArt Media.