Possible Clues:

• 'Picnic' playwright William
• “Picnic” playwright
• 'Splendor in the Grass' playwright
• Pulitzer playwright William
• "Bus Stop" playwright William
• Pulitzer-winning playwright William
• 'A Loss of Roses' playwright
• 'Natural Affection' playwright
• 'The Dark at the Top of the Stairs' playwright
• Kansas-born playwright