Karel Boleslav Jirák (né Karel Bohuslav Jirák; January 28, 1891, Prague, Bohemia – January 30, 1972, Chicago, Illinois, U.S.) was a Czechoslovak composer and conductor. Jirák became a pupil of Josef Bohuslav Foerster and Vítězslav Novák at the Charles University and at music academy in Prague. From 1915-18 he was the Kapellmeister at the Hamburg Opera and worked from 1918 to 1919 as a conductor at the National Theatre in Brno and Ostrava. From 1920-30, he was a composition teacher at the Prague Conservatory, and principal conductor of the Czechoslovak Radio Orchestra until 1945. In 1947, he em