Esteban Sarmiento is a primatologist and functional anatomist. His main field of study is the skeleton

Skeleton

The skeleton is the body part that forms the supporting structure of an organism. There are two different skeletal types: the exoskeleton, which is the stable outer shell of an organism, and the endoskeleton, which forms the support structure inside the body.In a figurative sense, skeleton can...

s of hominoids, both extinct species and extant species.
Sarmiento is one of the few mainstream experts to give serious attention to cryptozoology

Cryptozoology

Cryptozoology refers to the search for animals whose existence has not been proven...

, particularly reports of Bigfoot

Bigfoot

Bigfoot, also known as sasquatch, is an ape-like cryptid that purportedly inhabits forests, mainly in the Pacific Northwest region of North America. Bigfoot is usually described as a large, hairy, bipedal humanoid...

. Sarmiento does not suggest that the existence of Bigfoot has been established, but that its existence is possible and that claims and evidence deserve careful scrutiny, stating, "If [Bigfoot is] real, this animal is exceedingly human-like [...] It would be our closest relative on earth.” He has appeared on several episodes of the History Channel series Monster Quest

Monster Quest

MonsterQuest is an American television series that originally aired from October 31, 2007 to March 24, 2010 on the History channel...

discussing Bigfoot and other "cryptid

Cryptid

In cryptozoology and sometimes in cryptobotany, a cryptid is a creature or plant whose existence has been suggested but is unrecognized by scientific consensus and often regarded as highly unlikely. Famous examples include the Yeti in the Himalayas and the Loch Ness Monster in...

s."