Prompt
"Generate a realistic portrait of Richard Thaler, a middle-aged American economist and professor, sitting in a professional setting, possibly in front of a bookshelf or a University of Chicago Booth School of Business backdrop, with a thoughtful expression, wearing a suit and tie, and holding one of his notable books, such as 'Nudge' or 'Misbehaving: The Making of Behavioral Economics', with a subtle nod to his contributions to behavioral economics and finance."