Professor John George Jack was an American dendrologist. Dendrology is the science and study of woody plants (trees, shrubs, and lianas), specifically, their taxonomic classifications.
Born in Chateauguay, Quebec, Canada on April 15, 1861, John was one of twelve children of Robert and Annie Jack. Robert Jack (1821-1900) was a farmer and fruit grower who, for over 40 years, introduced and experimented with varieties of fruit new to the Province of Quebec. Annie Linda Jack (1839-1912), a poet, author and a noted horticulturist wrote a series of newspaper articles entitled "Garden Talks" and authored "The Canadian Garden; a Pocket Help for the Amateur" (1903).
A number of species were named for Jack:
- Sinojackia Hu
- Alnus jackii
- Amelasorbus jackii Rehd.
- Betula jackii Schneid.
- Crataegus jackii Sarg.
- Juniperus communis var. jackii Rehd.
- Populus jackii Sarg.
- Quercus jackiana Schneid.
- Rosa maximowiczii var. jackii (Rehd.)
- Viburnum jackii
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