A rotund, jovial New Yorker, David Healy obligingly played every manner of stereotypical American in British films and on television for more than thirty years. The son of an Australian father and an American mother, he spent much of his youth in Texas. Studying at Southern Methodist University in Dallas, he majored in drama and befriended another young acting hopeful, named Larry Hagman. David first arrived in England as a member of the U.S. Air Force and soon wound up, along with Hagman, in the cast of a touring show written by John Briley. This later grew into The Airbase (1965), a 25-minut…