What examples can you find of these? I want the list to include people who satisfy two criteria: (a) Major political leader = king, president, prime-minister, very senior cabinet minister, mayor of capital, something in this league. (b) Scientist = someone who has actively worked in science (published papers or books) or at the very least had an impressive career in industrial R&D (with technical accomplishments, not just as a bureuacrat).
One example: Chaim Weizmann. Another, less obvious one which makes the cut nevertheless: Yury Luzhkov
EDIT: Adding from answers: Angela Merkel, Tony Tan.
