impresario
Concise Oxford English Dictionary © 2008 Oxford University Press:
impresario /ˌɪmprɪˈsɑːrɪəʊ/
▶noun (pl. impresarios) a person who organizes and often finances theatrical or musical productions.
■ chiefly historical the manager of a musical, theatrical, or operatic company.
– origin C18: from Ital., from impresa ‘undertaking’.
'impresario' also found in these Oxford entries:

