The son of housepainter Alexander Rosa and Mary Elizabeth Henshaw, Rosa was probably born in Australia but grew up in London, where he attended St Andrew's School and the Polytechnic School of Art in Regent Street.
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In 1888 he moved to Melbourne and established the local branch of the Australian Socialist League; on 20 July 1889 he formed the Social Democratic League with William Maloney and W. D. Flinn, publishing a pamphlet, Social Democracy, in 1890.
Sam Neill | Rosa | Sam Cooke | Sam Shepard | Sam Phillips | Uncle Sam | Sam Raimi | Santa Rosa | Sam Houston | Sam Brownback | Salvator Rosa | Rosa Parks | Yosemite Sam | Rosa Luxemburg | Fort Sam Houston | Sam's Club | Santa Rosa, California | Sam Peckinpah | Sam Mendes | Sam Waterston | Sam Worthington | Sam & Dave | Sam Taylor-Wood | Sam Houston State University | Santa Rosa Island, California | Sam Kelly | Sam Bush | Rosa DeLauro | Sam Zell | Sam Spade |