Harold Prince — American Producer born on January 30, 1928,

Harold Smith "Hal" Prince is an American theatrical producer and director associated with many of the best-known Broadway musical productions of the past half-century. He has garnered twenty-one Tony Awards, more than any other individual, including eight for directing, eight for producing the year's Best Musical, two as Best Producer of a Musical, and three special awards... (wikipedia)

Collaboration is just, really, a group of people getting in a room with their eye on a very similar prize and wanting to come out with the same show. The director, ultimately, is the guy in front of whom the buck stops. So, he has to have the courage to prevail. But, he has got to have a huge amount of respect for his collaborators.
Artistic self-indulgence is the mark of an amateur. The temptation to make scenes, to appear late, to call in sick, not to meet deadlines, not to be organized, is at heart a sign of your own insecurity and at worst the sign of an amateur.
I got successful awfully quick, and I wanted it... But I do think there is responsibility to move the musical theater form forward. I think you always have to be aware of the work that came before and build on that.
I was there when the quote-unquote golden age of musical theater was flourishing. I met everybody who worked in theater or was famous in theater from the '40s on.
I'm always glad to see somebody rethink something rather than reproduce something I did.