>Leon Black
Apparently was the investment banker for Samuel Heyman who died during heart surgery in 2009. Leon commented about Heyman's art collection in an article and Heyman's wife is apparently friends w/ Hillary per a DoS FOIA document.
https://foia.state.gov/search/Results.aspx?searchText=%22leon%20black%22&beginDate=&endDate=&publishedBeginDate=&publishedEndDate=&caseNumber=