No television program would be complete without co-stars and supporting players. This book pays homage to those over 220 individuals who acted with David Janssen in his pilot movie, and one season of twenty-two episodes of O'Hara-United States Treasury from 1971 through 1972. I hope you enjoy learning more about those hard-working men, women and children who worked with the talented David Janssen on his fantastic television show! DW