Pamela Colman Smith

For anyone unaware, Pamela Colman Smith is the artist of the Rider-Waite Tarot deck, the first mass-market Tarot deck and possibly the most important and successful deck of all time.

While the deck was dreamed up and systematically organized by Waite and published by Smith, it was Colman who was commissioned to illustrate the cards, and interestingly, single-handedly created the visuals for the entirely of the Minor Arcana.

If you'd like to read more on Smith, an interesting short article can be found here.
Of course, the background on her can also be found on her Wikipedia.