Poole wrote a number of monographs on European and British colonial postage stamps which were published in Mekeels Handbook between 1912 and 1923. He contributed numerous articles to other philatelic journals and authored the books: The Standard Philatelic Dictionary in 1922 and The Pioneer Stamps of the British Empire in 1957. He also published his own Philatelic Opinion journal from 1912 to 1931. And, in 1917 he co-authored United States Virgin Islands with Julius (John) Murray Bartels.
Poole had a broad depth of collecting interests, but tended to specialize in stamps of Haiti and South and Central America. He was active in philatelic societies and was appointed judge at the 1913 International Philatelic Exhibition in New York City. Poole also was a stamp dealer and auctioneer.