Possible Clues:

• Stage's Hagen
• "A Challenge for the Actor" author Hagen
• Abbr. on Salt Lake City buses
• Late stage actress Hagen
• 'A Challenge for the Actor' author Hagen
• She played Martha in Broadway's 'Who's Afraid of Virginia Woolf?'
• Acting teacher's first name
• 1993 New York City Marathon winner Pippig
• Hagen of Hollywood
• Theater's Hagen