Subsequently he specialized in the technique called dalles de verre sous beton, a method using coloured glass and concrete, developed in France after the second world war, and which he developed as a distinctive style during a return visit to France in 1964, when he studied the work of Gabriel Loire in Chartres, which profoundly informed his approach to the medium.
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The Dove of Peace window was installed in the house of Greenacre in Sant Fruitós de Bages.
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Portraits in glass expressing the character and personality of saints and historical figures, were shown in prints of windows in southern Africa, as well as an important work - a window depicting Saint Francis - in a Franciscan monastery church near Ponticelli in Italy.
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In 2000 a retrospective exhibition Leo Théron's work, A Life in Glass, was opened in Sant Fruitós de Bages, some 55 km from Barcelona, Catalonia.
Leo Tolstoy | Pope Leo XIII | Charlize Theron | Leo Gorcey | Leo Burnett | Leo Brouwer | Leo VI the Wise | Leo | Pope Leo X | Leo Durocher | Wadada Leo Smith | Ted Leo | Pope Leo I | Pope Leo IX | Melissa Leo | Leo Carrillo | Ted Leo and the Pharmacists | Leo Castelli | Leo Burnett Worldwide | San Leo | Leo Strauss | Leo Marks | Leo Laporte | Léo Ferré | Leó Szilárd | Leo Slezak | Leo Frobenius | Leo Cárdenas | Pope Leo XII | Leonardo Leo |