Happy Henslow Day! John Stevens Henslow (1796–1861) Today is the 213th anniversary of the birth of Charles Darwin's great friend and mentor, John Stevens Henslow. You can read more abour Henslow in this article which I wrote 9 years ago. Nine years! Holy Crap! By Richard Carter, FCD Writer and photographer Richard Carter, FCD is the founder of the Friends of Charles Darwin. He lives in Hebden Bridge, West Yorkshire.Website • Facebook • Twitter • Newsletter • Books View all of Richard Carter, FCD's posts.