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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. 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/>  

Loss's books include ''The American Presidents'' and ''Great Events from History: North American Series, 1895-1955'', the latter co-authored with Frank Northern Magill.<ref>{{cite web|

Loos's books include ''The American Presidents'' and ''Great Events from History: North American Series, 1895-1955'', the latter co-authored with Frank Northern Magill.<ref>{{cite web|

url=http://www.bookfinder.com/author/john-l-loos/|title=John L. Loos|publisher=Salem Press|accessdate=October 1, 2011}}</ref>

url=http://www.bookfinder.com/author/john-l-loos/|title=John L. Loos|publisher=Salem Press|accessdate=October 1, 2011}}</ref>In 1964, Loos published a six-page article on Lewis and Clark, "They Opened the Door to the West" on Lewis and Clark.<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>

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 in Baton Rouge, where Loos had been an active member for more than fifty years. 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 in Baton Rouge, where Loos had been an active member for more than fifty years. 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/>