Jack Daniel
Legend
The reason why Rangers are spellcasters stems back from D&D's origin as a wargame that wanted to emulate the Lord of the Rings. Because Gygax couldn't think of any way to separate Aragon's feats like preternatural tracking skill or knowledge of medicinal herbs from the fledgeling spells system, he decided to simply give rangers a handful of spells.
Gygax didn't create the ranger class.