Modern minimalist mathematician, male, 30s, bespectacled, short brown hair, casual wear, white shirt, dark jeans, sneakers, holding chalk, standing in front of a blackboard filled with complex equations, surrounded by architectural models, geometric shapes, and diagrams, in a sleek, high-ceilinged, well-lit studio with large windows, cityscape view, sunny day, soft natural light, shallow depth of field, realistic rendering.