Leon (or Leo) Gritzinger wanted to be a professional military, but in the army, his voice was discovered, and he was granted a leave for vocal studies in Vienna. From 1879, he sang in the choir of the Vienna Hofoper; in 1882, he was promoted to soloist, singing a lot of small parts, and in 1884 to heldentenor. He had his first successes as Éléazar, Lohengrin and Vasco da Gama. He stayed in Vienna until 1890.
Repertory, other than the roles already mentioned: Stolzing, Tannhäuser, Siegmund, Jean de Leyde, Florestan.
Reference: Kutsch & Riemens