Teacher- Who am I?

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Across
  1. 2. Likely to be found dancing
  2. 3. Tall, reading enthusiast
  3. 5. Always not wrong
  4. 8. An ancient city to the north of Sheffield
  5. 11. Rivers, coasts and cities
  6. 12. KFC creator, Maths wizz
Down
  1. 1. Be prompt to school or else!
  2. 4. Big red dog, Attendance obsessed
  3. 6. Let me know if you have an appointment
  4. 7. I know my protected characteristics
  5. 9. Powerful with periodic tables
  6. 10. Primarily used for Weighing