lol wrong william hooker. The color was named for william hooker but he was a botanical artist in the 1700's-1800's. Ah here's what was in one of my ooold art history books:
William Hooker was a British botanical artist, particularly esteemed for his depictions of fruit, who gave his name to the paint color Hooker’s Green. He served as the official artist to the Horticultural Society of London from 1812 to 1820 and regularly illustrated their Transactions. After studying botanical illustration with Francis Bauer, he co-published the botanical periodical Paradisus Londinensis with R.A. Salisbury from 1805 to 1808. Hooker engraved the drawings of James Forbes for Oriental Memoirs (1813-15). He was no relation to his contemporary Sir William Jackson Hooker, a famous botanist who was director of Kew Gardens.
It's kind of ironic that two men around the same time period had.. the same name and the same love of botany. Here's another site that has some information on him (it's an antique dealer's site, it's really quite hard to find information on HIM and not the Kew director):
[link] it has both the Sir william and then below it, his name.