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In 1955, he began his professorship at LSU in [[Baton Rouge]], where he specialized in the history of the American West, with emphasis on the life of [[William Clark]], partner of [[Meriwether Lewis]] in the 1804-1806 Corps of Discovery, following the [[Missouri River]] to the Pacific Coast. Loos' 511-page study, ''William Clark's Part in the Preparation of the Lewis and Clark Expedition'', was published in 1954 by the Missouri Historical Society.<ref>{{cite book|url=http://books.google.com/books/about/William_Clark_s_part_in_the_preparation.html?id=cS31GwAACAAJ|title=William Clark's Part in the Preparation of the Lewis and Clark Expedition|publisher=Missouri Historical Society|accessdate=October 3, 2011}}</ref>In 1964, Loos published a six-page article on Lewis and Clark, "They Opened the Door to the West", suitable as a lecture guide.<ref>{{cite web|url=http://books.google.com/books/about/They_opened_the_door_to_the_west.html?id=n-oacgAACAAJ|title="They Opened the Door to the West"|publisher=books.google.com|accessdate=October 1, 2011}}</ref>

In 1955, he began his professorship at LSU in [[Baton Rouge]], where he specialized in the history of the American West, with emphasis on the life of [[William Clark]], partner of [[Meriwether Lewis]] in the 1804-1806 Corps of Discovery, following the [[Missouri River]] to the Pacific Coast. Loos' 511-page study, ''William Clark's Part in the Preparation of the Lewis and Clark Expedition'', was published in 1954 by the Missouri Historical Society.<ref>{{cite book|url=http://books.google.com/books/about/William_Clark_s_part_in_the_preparation.html?id=cS31GwAACAAJ|title=William Clark's Part in the Preparation of the Lewis and Clark Expedition|publisher=Missouri Historical Society|accessdate=October 3, 2011}}</ref>In 1964, Loos published a six-page article on Lewis and Clark, "They Opened the Door to the West", suitable as a lecture guide.<ref>{{cite web|url=http://books.google.com/books/about/They_opened_the_door_to_the_west.html?id=n-oacgAACAAJ|title="They Opened the Door to the West"|publisher=books.google.com|accessdate=October 1, 2011}}</ref>

At LSU, Loos was a graduate advisor and taught the introductory seminar on historical methods for all first-year graduate students in history.<ref name=obit/>For a quarter century, he was the chairman of the Department of History and also an interim dean of the College of Arts and Sciences. In 1983, he was named an LSU "alumni professor" in recognition of his scholarship. On mandatory retirement in 1988 at the age of seventy, he became professor emeritus. Loos spoke before various organizations, including the Louisiana Historical Association, of which he was president in 1976,<ref>{{cite web|url=http://www.lahistory.org/site8.php|title=Presidents of the Louisiana Historical Association|publisher=lahistory.org|accessdate=October 1, 2011}}</ref> and the Organization of American Historians.<ref name=obit/>  

At LSU, Loos was a graduate advisor and taught the introductory seminar on historical methods for all first-year graduate students in history.<ref name=obit/>For a quarter century, he was the chairman of the Department of History and also an interim dean of the College of Arts and Sciences. In 1983, he was named an LSU "alumni professor" in recognition of his scholarship. Upon mandatory retirement in 1988 at the age of seventy and after twenty-five years as department chairman, he was honored with the designation professor emeritus. During his career, Loos spoke before various organizations, including the Louisiana Historical Association, of which he was president in 1976,<ref>{{cite web|url=http://www.lahistory.org/site8.php|title=Presidents of the Louisiana Historical Association|publisher=lahistory.org|accessdate=October 1, 2011}}</ref> and the Organization of American Historians.<ref name=obit/>  

Other books by Loos include ''The American Presidents'' (1986), with co-authors Tracy Irons-Georges and Frank Northern Magill, and ''Great Events from History: North American Series, 1895-1955'', the latter also co-authored by Frank Magill.<ref>{{cite web|

Other books by Loos include ''The American Presidents'' (1986), with co-authors Tracy Irons-Georges and Frank Northern Magill, and ''Great Events from History: North American Series, 1895-1955'', the latter also co-authored by Frank Magill.<ref>{{cite web|