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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 along the [[Missouri River]] to the Pacific Coast. 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/>

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 along the [[Missouri River]] to the Pacific Coast. 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, Loos 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. He spoke before various organizations, including the Louisiana Historical Association, of which he was the 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/>  

For a quarter century, Loos 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 retirement, he became professor emeritus. Loos spoke before various organizations, including the Louisiana Historical Association, of which he was the 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/>  

Loos's books 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|

Loos's books 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|