Question: Who discovered the largest cliff dwelling in North America?

Context paragraphs:
House: A house is a building that functions as a home, ranging from simple dwellings such as rudimentary huts of nomadic tribes and the improvised shacks in shantytowns to complex, fixed structures of wood, brick, concrete or other materials containing plumbing, ventilation and electrical systems.  Houses use a range of different roofing systems to keep precipitation such as rain from getting into the dwelling space.  Houses may have doors or locks to secure the dwelling space and protect its inhabitants and contents from burglars or other trespassers.  Most conventional modern houses in Western cultures will contain one or more bedrooms and bathrooms, a kitchen or cooking area, and a living room.  A house may have a separate dining room, or the eating area may be integrated into another room.  Some large houses in North America have a recreation room.  In traditional agriculture-oriented societies, domestic animals such as chickens or larger livestock (like cattle) may share part of the house with humans.  The social unit that lives in a house is known as a household.

Cliff Palace: Cliff Palace is the largest cliff dwelling in North America.  The structure built by the Ancestral Puebloans is located in Mesa Verde National Park in their former homeland region.  The cliff dwelling and park are in the southwestern corner of Colorado, in the Southwestern United States.

Saltasauridae: Saltasauridae (named after the Salta region of Argentina where they were first found) — a family of armored herbivorous sauropods from the Upper Cretaceous.  They are known from fossils found in South America, Asia, North America, and Europe.  They are characterized by their vertebrae and feet, which are similar to those of "Saltasaurus", the first of the group to be discovered and the source of the name.  The last and largest of the group and only one found in North America, "Alamosaurus", was 34 m in length and the last sauropod to go extinct.

Americans Before Columbus: "Americans Before Columbus" begins with discussing the Ice Age and how humans crossed the Bering Strait and reached the New World and the reason archeologists were able to figure this out was because of the art the people created while passing through; such as cave art, baskets and stone weapons.  Then after hundreds of years of spreading out across the continents in the western hemisphere, each group began to remain sedentary, so cultures such as the eskimos up north, the cliff dwelling basket makers in the Rocky Mountains, the citadel hunter/gatherers in Mexico or the Incas in the south began to gain different customs and social behaviors such as religion, hierarchies and ways of maintaining one's home and group.  Through the work assembled by the patient and tireless efforts of the excavators, scientists, photographers and artist, Elizabeth Baity creates a book that goes into great deal explaining the process of how those ancient cultures came to be, and how modern day people were able to discover and learn about them.

Brachyhyops: "Brachyhyops" is an extinct genus of entelodont artiodactyl mammal that lived during the Eocene Epoch of western North America and southeastern Asia (including Mongolia, China, and Kazakhstan).  The first fossil remains of "Brachyhyops" are recorded from the late Eocene deposits of Beaver Divide in central Wyoming and discovered by paleontology crews from the Carnegie Museum of Natural History during the early 20th century.  The type species, "Brachyhyops wyomingensis", is based on a single skull and was named by E.H. Colbert in 1937, but was not officially described until 1938.  During the latter half of the 20th century, additional specimens from North America have been recorded from Saskatchewan and as far south as Texas, indicating that "Brachyhyops" had a broad distribution and was well-dispersed throughout western North America.

Erythronium americanum: Erythronium americanum (trout lily, yellow trout lily, yellow dogtooth violet) is a species of perennial, colony forming, spring ephemeral flower native to North America and dwelling in woodland habitats.  Within its range it is a very common and widespread species, especially in eastern North America.  The common name "trout lily" refers to the appearance of its gray-green leaves mottled with brown or gray, which allegedly resemble the coloring of brook trout.

Neochoerus pinckneyi: Neochoerus pinckneyi was a North American species of capybara.  While capybaras originated in South America, formation of the Isthmus of Panama three million years ago allowed some of them to migrate north as part of the Great American Interchange.  Capybaras and porcupines are the only caviomorph rodents that reached temperate North America during this exchange (a much greater diversity of North American rodents invaded South America).  At 90 to 113 kg (200 to 250 pounds), 40% larger than the living capybara, "N. pinckneyi" is one of the largest rodent species ever discovered, surpassed only by the recently discovered "Josephoartigasia monesi", several species of "Phoberomys", and possibly the Pleistocene giant beaver.  Remains have been found in southern North America and throughout Central America.  During the Pleistocene, they extended their range, from Arizona to Florida to South Carolina.

Trumpeter swan: The trumpeter swan ("Cygnus buccinator") is a species of swan found in North America.  The heaviest living bird native to North America, it is also the largest extant species of waterfowl with a wingspan that may exceed 10 ft .  It is the American counterpart and a close relative of the whooper swan ("Cygnus cygnus") of Eurasia, and even has been considered the same species by some authorities.  By 1933, fewer than 70 wild trumpeters were known to exist, and extinction seemed imminent, until aerial surveys discovered a Pacific population of several thousand trumpeters around Alaska's Copper River.  Careful reintroductions by wildlife agencies and the Trumpeter Swan Society gradually restored the North American wild population to over 46,000 birds by 2010.

Debert Palaeo-Indian Site: The Debert Palaeo-Indian Site is located nearly three miles southeast of Debert, Colchester County, Nova Scotia, Canada.  The Nova Scotia Museum has listed the site as a Special Place under the Special Places Protection Act.  The site acquired its special status when it was discovered as the only and oldest archaeological site in Nova Scotia.  The Debert site is significant to North American archaeology because it is the most North-easterly Palaeo-Indian site discovered to date.  It also provides evidence for the earliest human settlements in eastern North America, which have been dated to 10,500-11,000 years ago.  Additionally, this archaeological site remains one of the few Palaeo-Indian settlements to be identified within the region of North America that was once glaciated.

Richard Wetherill: Richard Wetherill (1858–1910), a member of a prominent Colorado ranching family, was an amateur explorer in the discovery, research and excavation of sites associated with the Ancient Pueblo People.  He is credited with the discovery of Cliff Palace in Mesa Verde and was responsible for initially selecting the term "Anasazi", Navajo for "ancient enemies," as the name for these ancient people.  He also discovered Kiet Seel ruin, now included, along with Betatakin ruin, in Navajo National Monument in northeastern Arizona.  "Slightly smaller than Cliff Palace, Kiet Seel possesses qualities that, in the eyes of some, lend it greater charm and interest."  Wetherill became fascinated by the ruins and artifacts and made a career as an explorer, guide, excavator and trading post operator.

Supporting paragraphs: Richard Wetherill Cliff Palace
Answer: Richard Wetherill