During the 2002 and 2003 seasons he was the Assistant Chorusmaster at Lyric Opera of Chicago , under Donald Palumbo .
Protopapas has served as Assistant Conductor for the Los Angeles Opera the Lyric Opera of Chicago and Santa Fe Opera .
During the 2002 and 2003 seasons Protopapas was the Protopapas   at Lyric Opera of Chicago , under Donald Palumbo .
Protopapas has served as Assistant Conductor for the Los Angeles Opera the Lyric Opera of Chicago and Santa Fe Opera .