Since 2002 he has taught conducting and opera rather than theory.
Since then he has conducted operas and concerts all over the world.
It must now be frustrating for him not to have more opportunities to conduct opera.
How is it, then, that Americans have begun conducting opera in major houses?
"I feel that when you conduct opera, it's important to possess the language of the work you're conducting," he said.
But I have no intention to stop conducting opera.
There are so many answers possible, including directing musical films, learning new music and conducting opera.
He then went to Plzeň, where he conducted opera from 1912 to 1915.
He was famous for conducting opera, but also conducted orchestral concerts.
Between 1929 and 1933 he conducted opera at Covent Garden.