His full name's Robert Pershing Wadlow. Also, the tallest hominids ever are humans. You're thinking of Gigantopithecus, which was a hominoid. I'm not merely being a pedant - Gigantopithecus was a quadruped, not a biped, so when it moved it was no taller than a person. Gravity also affects quadrupeds differently than bipeds, at least in terms of how the two basic body types adapt to gravity's effects.