Born in Vienna, he received his first training at the Graphische Lehr- und Versuchsanstalt, studying at the prominent Viennese academy from 1949 to 1956 under Josef Dobrovský.
[1] Collaborating with Friedensreich Hundertwasser at the Vienna Art Club, Mikl later was a member of the Galerie St. Stephan group.
[1] Classified as an Informal and Modernist artist, Mikl himself despised his artwork being placed under a specific label, calling it "an insult" in an undated interview.
[1] He worked in oil, pastels and water colors, as well as sculptures and drawings that either stood alone or served as illustrations in a book or decorations in a church.
[1] The hall once served as a venue for the first performance of Ludwig van Beethoven's 8th Symphony as well as a summit between U.S. President John F. Kennedy and Soviet leader Nikita S. Krushchev and was reopened in 1997 with vibrant reds and yellows depicting notable themes and figures of Austrian literature, all of Mikl's design.