- Father of actor Walter Slezak and Margarete Slezak.
- Ensemble member of the Berlin State Opera (1898-1900), the Vienna State Opera (1901-1926). Retired from opera in 1934 to devote his time to film acting.
- First known as an operatic tenor, especially renowned for his Wagnerian work, he would eventually quit singing and become a comedian in Austrian films.
- Grandfather of Erika Slezak.
- He had his last great success as sultan Abdul-Hamid in the movie "Münchhausen" (1943).
- His most famous performances he had as a Verdi and Wagner singer.
- His children Walter Slezak as an actor and Margarete Slezak as a singer continued the artistic tradition of the family.
- After an education as a gardener and locksmith he made his debut as a singer in Brünn in 1896 and launched from 1901 an unique career at the Wiener Staatsoper.
- In 1926 he became an honorary member of this opera house.
- The singer and actor Leo Slezak was one of the most popular tenors at the beginning of the 20th century.
- Leo Slezak conquered the big screen in 1932 and impersonated often funny characters.
- He was appointed a Kammersänger in 1905 had he had great successes at the New York Metropolitan Opera from 1909 to 1912.
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