He was apprenticed at an early age to a photographer while studying art, eventually earning a place at the National Academy of Art, where he studied under Bertalan Székely and Károly Lotz. He followed this with studies in Munich and Paris. László's portrait of Pope Leo XIII earned him a Grand Gold Medal at the Paris International Exhibition in 1900. In 1903, László moved from Budapest to Vienna. In 1907, he moved to England and remained based in London for the remainder of his life, although endlessly travelling the world to fulfil commissions.