British historian Thomas Pakenham is best known for his books about colonial Africa, but his real passion is trees. Huge trees. Majestic trees. Misshapen trees. Historic trees. Trees, as he puts it, with "noble brows and strong personalities" that are impossible to ignore.
Pakenham, 69, a self-taught photographer, has already parlayed his arboreal love affair into a best-selling collection of portraits of 60 remarkable British and Irish trees. On the strength of that book's unexpected success (and the bbc series that grew from it), he has spent the past four years roaming five continents, 30 lbs. of camera equipment in...