How to pronounce “castelli” in English

Of course, Castelli sadly died in 1999.

And you know, then it takes you to Castelli.

But that Venice Biennale in 1964 was really famous, because that was the one that Leo Castelli, who was like the all time American godfather art dealer,

So you know, the passion that Castelli brought to this, the high priority of trying to get this work placed

How did you go about sort of getting those interviews, researching, and specifically, some of the historical figures like Castelli?