Barringer was a Quaker, born in Yorkshire, England. He served in an ambulance unit during World War I, was wounded in action in France and returned to the UK in 1917. After the war he worked at various times as a civil servant (Senior Information Officer with the Central Office of Information) and as an editor for English publishers Thomas Nelson & Sons, for the BBC as an editor on the Radio Times, and in Amalgamated Press as an editor in their encyclopedia department. At Amalgamated Press that he provided outlines of world history for their famous Children's Encyclopedia. Barringer and his wife had four daughters.

Most of Barringer's written works were originally published in the 1920s and 1930s, and included the three volumes of the Neustrian Cycle and three independent historical novels set in medieval England.

The Neustrian Cycle

Barringer's main body of work, the Neustrian Cycle, is a trilogy beginning with Gerfalcon; these novels were set around the fourteenth century in an alternate medieval France called Neustria (historically an early division of the Frankish kingdom). According to John Clute, "The basic premise, vaguely presented, is that the Merovingian Dynasty does not split apart cAD750; instead, Neustria survives, and at the time of the three tales (c1400) is still thriving." He notes further that "The sequence's alternative-world displacement serves not as an opening for magic but as a freeing of LB's imagination; the Neustria Cycle is far more intense and eloquent than his more-straightforward historical novels." The three books revolve around the character of Raoul of Ger, the protagonist of the first book and a secondary character in the later two, Joris of the Rock and Shy Leopardess. Each is a coming of age story.

Obscure as an author during his own lifetime, after his death his fantasies were rediscovered and critically praised by later fantasy authors such as L. Sprague de Camp and Lin Carter, leading to revived interest in them. As a result, a number of reprints appeared in the 1970s and 1980s, most notably as volumes 7, 9 and 13 of the Newcastle Forgotten Fantasy Library in 1976-77. To date there has been no comparable revival of Barringer's other works.

All of Barringer's books are now out of print, although the volumes of the Neustrian Cycle are available as e-books. Copies of all of his works are held in the British Library in London.

Neustrian cycle

• Gerfalcon (Heinemann 1927, 310 p)
• Joris of the Rock (Heinemann 1928, 325 p)
• Shy Leopardess (Methuen 1948, 392 p)

Historical novels

• Kay the Left-Handed (Heinemann 1935, 284 p)
• Know Ye Not Agincourt? (Nelson 1936, 207 p)
• a Story of the Wars of Lancaster and York (Phoenix House 1953, 160 p)