David Leopold, Claire Fraenkel, Joseph Cullen, Lawrence Boothman, and Sasha Wilson in The Brief Life and Mysterious Death of Boris III - King of Bulgaria. Photo by Carol Rosegg.Stagebiz is happy to post an interview with Joe Cullen, Co-Author of The Brief Life and Mysterious Death of Boris III, King of Bulgaria, which recently finished a run at 59 E. 59 Theaters Boris III of Bulgaria is a rather obscure historical figure to most of us, including historians, so what is it about his situation that interested you?  Firstly, co-writer Sasha Wilson is American Bulgarian and her O’papa (grandad) introduced us to this incredible