2 books · Ages 8–12 · Chapter Books
National Geographic Photobiographies is a 2-book series for ages 8–12 by Tom L. Matthews. Each book stands alone — start anywhere.
Start anywhere — each book stands alone.
That said, Light Shining Through the Mist: A Photobiography of Dian Fossey and Always Inventing: A Photobiography of Alexander Graham Bell are great first picks.
No particular order needed — browse and pick what catches your eye.