A Warm and Approachable Medical Professor in a Modern Classroom

Character traits: A 65-year-old male American doctor and professor, with grayish-white hair, a kind expression, and a gentle smile. Clothing style: No white coat, wearing a sweater or wool coat (warm colors like beige, gray, brown, etc.), with a shirt underneath. Props details: Wearing glasses, with a stethoscope on the table, reflecting a medical background. Scene background: A modern university lecture hall or medical classroom, with a teaching projection screen at the back. Atmosphere: Natural soft light, warm, professional, and approachable.