He is a businessman and Irma is a professor of psychology at the Albert Einstein College of Medicine of Yeshiva University.
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http://www.faqs.org/tax-exempt/NY/Andrew-Irma-Hilton-Foundation-Inc.html
http://www.ratemyprofessors.com/ShowRatings.jsp?tid=892355
http://www.corporationwiki.com/New-York/New-York/hilton-andrew-c-9480264.aspx
http://coltindustries.com/
http://www.zoominfo.com/people/Hilton_Irma_367726776.aspx
http://www.nytimes.com/1989/09/03/style/deborah-ellen-mcalister-is-engaged-to-wed-christopher-jones-in-autumn.html