Daniel Shapiro, director and founder of the Harvard International Negotiation Program, has negotiated some of the most challenging conflicts with heads of state, corporate executives and even families.  Shapiro recently   joined us on the Knowledge at Wharton show   on Wharton Business Radio on SiriusXM channel 111  to talk about his new book on the subject, Negotiating the Nonnegotiable: How to Resolve Your Most Emotionally Charged Conflicts . An edited transcript of the conversation follows. Knowledge at Wharton: I found it interesting that your book takes a look at both ends of the spectrum, both the personal and the professional. When it comes to resolving conflict in the office, a lot of the same types of incidents and issues arise at home and work that could be negotiated in the same kind of manner.…