Prompt
"Generate a realistic portrait of John Paul Holdren, a middle-aged American physicist and environmental policy expert, sitting in a professional setting with a subtle background that hints at his connection to science and policy, such as a bookshelf with scientific texts or a window with a view of a sustainable landscape. Incorporate a few symbolic elements that reflect his work, like a small model of the Earth or a book related to environmental science. Capture his expression as thoughtful and authoritative, wearing glasses and dressed in attire suitable for a professor or a high-level advisor, such as a suit or a blazer. Incorporate his signature in a corner of the image or as a watermark, blending it subtly into the composition."
