J. T. Gulick
John Thomas Gulick was an American missionary and naturalist from Hawaii. He performed some of the first modern evolutionary studies, starting with a collection of Hawaiian land snails.
Gulick was born in Waimea on Kaua i Island, during the Kingdom of Hawaii. His father was missionary Peter Johnson Gulick and mother was Fanny Gulick . In 1851, he started to collect and study Hawaiian land snails. He had been interested in snails since his early teens, and developed independently the concept of their evolution. He discovered many species of snails were only found in very specific areas within the islands, and there was no overlap between these areas.
Source: Wikipedia