Question: Which was a Greenlandic/Danish polar explorer and anthropologist, had members in his Second Danish Thule Expedition?
Context: Ejnar Mikkelsen (23 December 1880 in Vester-Brønderslev – 1 May 1971 in Copenhagen), was a Danish polar explorer and author.  He is most known for his expeditions to Greenland. Comer's Midden was a 1916 archaeological excavation site near Thule (modern Qaanaaq), north of Mt. Dundas in North Star Bay in northern Greenland.  It is the find after which the Thule culture was named.  The site was first excavated in 1916 by whaling Captain George Comer, ice master of the Crocker Land Expedition's relief team, and of members of Knud Rasmussen's Second Danish Thule Expedition who were in the area charting the North Greenland coast. Ernest Frederick "Fred" Roots {'1': ", '2': ", '3': ", '4': "} (5 July 1923 – 18 October 2016) was a Canadian geologist, polar explorer, educator and public servant.  After graduating with undergraduate and master's degrees in geology from the University of British Columbia and a doctorate from Princeton University, Roots joined the Scott Polar Research Institute and was appointed Chief Geologist for the 1949 to 1952 Norwegian–British–Swedish Antarctic Expedition.  During the expedition, in addition to ground-breaking geological and glaciological research studies, he made a 189-day, unsupported dog sled journey across the continent; a record that still stood at the time of his death over six decades later.  On his return to Canada he joined the Geological Survey of Canada with whom he served as a field geologist until 1958, when he left to help found the Polar Continental Shelf Program.  After 14 years with PCSP, Roots left to act as science advisor to the newly created federal Department of the Environment, where he remained on staff until 1989.  After retirement, Roots remained an active participant in polar research, and also became a key mentor within the Students on Ice educational program.  He continued to participate in expeditions for Students on Ice well into his tenth decade, his last being to Greenland only two months before his death. Sir Walter William "Wally" Herbert (24 October 1934 – 12 June 2007) was a British polar explorer, writer and artist.  In 1969 he became the first man fully recognized for walking to the North Pole, on the 60th anniversary of Robert Peary's famous, but disputed, expedition.  He was described by Sir Ranulph Fiennes as "the greatest polar explorer of our time". Booth Island (or Wandel Island) is a rugged, Y-shaped island, 5 mi long and rising to 980 m off the northwest coast of Kiev Peninsula in Graham Land, Antarctica in the northeastern part of the Wilhelm Archipelago.  Booth Island is located at .  Discovered and named by a German expedition under Eduard Dallmann 1873–74, probably for Oskar Booth or Stanley Booth, or both, members of the Hamburg Geographical Society at that time.  The Advisory Committee on Antarctic Names has rejected the name "Wandel Island", applied by the Belgian Antarctic Expedition —in honour of Danish polar explorer and hydrographer Carl Frederick Wandel, 1897–99, in favor of the original naming.  The narrow passage between the island and the mainland is the scenic Lemaire Channel. Summit Camp, also Summit Station, is a year-round research station on the apex of the Greenland Ice Sheet.  Its coordinates are variable, since the ice is moving.  The coordinates provided here are as of July 2009.  The station is located 3216 m above sea level.  The population of the station is typically five in wintertime, and has peaked at 55 in the summer.  The station is operated by the American-based CH2M HILL Polar Services (formerly known as "Veco Polar Resources"), with support from the United States' National Science Foundation.  A permit from the Danish Polar Center (Danish: "Dansk Polarcenter" ) under the auspices of the Home Rule Government of Greenland (Greenlandic: "Kalaallit Nunaanni Inatsisartut" ) is required to visit the station. Knud Johan Victor Rasmussen (7 June 1879 – 21 December 1933) was a Greenlandic/Danish polar explorer and anthropologist.  He has been called the "father of Eskimology" and was the first European to cross the Northwest Passage via dog sled.  He remains well known in Greenland, Denmark and among Canadian Inuit. Kaj Birket-Smith (20 January 1893 – 28 October 1977) was a Danish philologist and anthropologist.  He specialized in studying the habits and language of the Inuit and Eyak.  He was a member of Knud Rasmussen's 1921 Thule expedition.  In 1940, he became director of the Ethnographic Department of the National Museum of Denmark. Mullins Valley ( ) is a four mile long valley located at 5,400 ft elevation in the McMurdo Dry Valleys.  It is one of the few dry valleys in the world to contain rock glaciers.  US Antarctic Program (USAP) research has dated the subsurface ice in Mullins Valley at 4 million years old making it among the oldest ice on earth.  United States Antarctic Program (USAP) research has also shown the rock glaciers in the valley to be analogous to the Arsia Mons region on Mars.  Named for Jerry L. Mullins, Physical Scientist, Director, Polar Programs, Antarctic and Arctic Program for United States Geological Survey (USGS), National Science Foundation Antarctic geophysical research, and U.S Scientific Committee (SCAR) delegate to SCAR SCAGI committee.  Appointed by the National Academy of Sciences, Polar Research Board.  His was responsible for Antarctic field research in the Transantarctic Mountains, McMurdo Dry Valleys, Shackleton Mountains, Beardmore Mountains, Antarctic Peninsula, Mount Siple, Amundsen-Scott South Pole station and at deep field research locations in West Antarctica.  His program conducted research in the disciplines of global positioning systems, geodesy, crustal motion, glacial geophysics, airborne geospatial systems, airborne geophysics, seismology, light radar (lidar), topographic mapping and he managed the USGS South Pole winter-over program from 1989 to 1994.  He was appointed by the National Academy of Sciences, Polar Research Board as a US delegate to the Scientific Committee on Antarctic Research Geosciences Standing Scientific Group from 1995–July 2012 and was appointed as a member of the Advisory Committee on Antarctic Names in 1994.  Mullins Valley appears in the Antarctic research literature, on the maps from the British expedition of Captain Scott and in aerial photographs from the United States expedition Operation Highjump by Admiral Byrd.  Mullins Valley, Mullins Lake, Mullins Glacier, and Mullins Geodetic Station, Antarctica are named for United States polar explorer and researcher Jerry L. Mullins. Greenlandic is an Eskimo–Aleut language spoken by about 57,000 Greenlandic Inuit in Greenland.  It is closely related to the Inuit languages in Canada such as Inuktitut.  The main variety, Kalaallisut or West Greenlandic, has been the official language of the Greenlandic autonomous territory since June 2009; this is a move by the Naalakkersuisut (government of Greenland) to strengthen the language in its competition with the colonial language, Danish.  The second variety is Tunumiit oraasiat or East Greenlandic.  The Thule Inuit of Greenland, Inuktun or Polar Eskimo, is a recent arrival and a dialect of Inuktitut.
Answer: Knud Johan Victor Rasmussen