Born in Westminster, London, into a family of masons (his father and grandfather worked on churches by William Butterfield and on the restoration of Westminster Abbey), Poole trained at Lambeth School of Art, 1888, and at the RA Schools, 1892-7, before serving apprenticeships with Harry Bates and G F Watts. He assisted both with two of their finest works; Bates' Lord Roberts Monument, Calcutta (1894-8), and Watts' Cecil Rhodes Memorial, Mopoto Hills, Bulawayo, and its copy, Physical Energy, in Kensington Gardens, London.
Becoming a prolific architectural sculptor Poole produced much of his finest work for architects Lanchester & Rickards, executing the sculpture on their Cardiff City Halls (1897), West Ham and Deptford Town Halls (1903) and Rotherhithe Town Hall.
Poole also executed a porcelain figure for the façade of their Colnaghi and Obach's Gallery, Bond Street, London (1912), and, in 1916, became re-associated with Bates' Lord Roberts Monument when he was invited by Lady Roberts and Bates' widow to execute a copy of the original as Glasgow's memorial to the Field Marshall. Poole also worked with on the public monuments to King Edward VII , Bristol (1913) and to Captain Albert Ball, Nottingham (1918). He exhibited ideal work and portraits at the RA, 1912, 1927, and was elected ARA, 1920, and RA, 1927. A member of the Art Workers' Guild , he was a Trustee of and Master of Sculpture at the RA Schools.