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From 1948 to 1951, Loos was an assistant professor at Evansville College in Evansville, [[Indiana]]. He received his Ph.D. in history from [[Washington University]] in [[St. Louis]],  [[Missouri]]. From 1953 to 1955, he was an instructor of United States history at the John Burroughs School in St. Louis. In 1955, he began his 34-year tenure at LSU in [[Baton Rouge]], where he specialized in the history of the American West, with great detail 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 for all first-year graduate students in history.<ref name=obit/>

From 1948 to 1951, Loos was an assistant professor at Evansville College in Evansville, [[Indiana]]. He received his Ph.D. in history from [[Washington University]] in [[St. Louis]],  [[Missouri]]. From 1953 to 1955, he was an instructor of United States history at the John Burroughs School in St. Louis. In 1955, he began his 34-year tenure at LSU in [[Baton Rouge]], where he specialized in the history of the American West, with great detail 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 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 ref|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. He was active in the University Presbyterian Church in Baton Rouge for more than fifty years.<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. He was active in the University Presbyterian Church in Baton Rouge for more than fifty years.<ref name=obit/>  

Loos died at the age of ninety-three at a nursing home in Lafayette, Louisiana. Memorial services  were to be held on October 2 at University Presbyterian Church. Interment was to follow on October 4 at Harvard Cemetery in Harvard, Nebraska. Loos was survived by his wife, the former Helen Nunn; his son and daughter-in-law, Peter J. and Elizabeth S. Loos; daughter, Katherine M. Loos, and four grandchildren.<ref name=obit/>

Loos died at the age of ninety-three at a nursing home in Lafayette, Louisiana. Memorial services  were to be held on October 2 at University Presbyterian Church. Interment was to follow on October 4 at Harvard Cemetery in Harvard, Nebraska. Loos was survived by his wife, the former Helen Nunn; his son and daughter-in-law, Peter J. and Elizabeth S. Loos; daughter, Katherine M. Loos, and four grandchildren.<ref name=obit/>