Recently, I was fortunate to have the opportunity to see a film presentation on the Northwestern University campus of the National Theatre of Great Britain’s live production of “The Lehman Trilogy” which is scheduled to open for a limited engagement on Broadway March 7 at the James M. Nederlander Theatre in New York City.Originally written by Stefano Massini, adapted by Ben Power and directed by Sam Mendes, it is a magnificent, three-character, three-act, three-hour plus epic dramatically chronicling the …