Bill Nye, known as "Bill Nye the Science Guy," is a tall and slender man with a clean-shaven face. Has a thick, neatly groomed head of dark brown hair. Wears a white lab coat, colorful bow ties, and button-down shirts. expressive facial features and friendly smile. prominent jawline. American science educator, television presenter, and mechanical engineer; gained fame throu his educational television show called "Bill Nye the Science Guy,". He 37 is years old. Obsessed with climate change.