It's a puzzlement!

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Across
  1. 2. A favorite party snack
  2. 6. What he celebrates 364 days each year
  3. 10. Kind of birthday we wish for him
  4. 13. Hands these out on holidays
  5. 14. Ask and you are certain to hear them
  6. 15. He knows how to manage these
Down
  1. 1. He has a very good sense of this
  2. 3. If it's your birthday, you're sure to hear this
  3. 4. Wait five minutes and you'll get one
  4. 5. Subject of Abbott and Costello's famous bit
  5. 7. One of the best in the building
  6. 8. His other title, much respected
  7. 9. He's an expert in this subject
  8. 11. Demonstrates to certain families
  9. 12. What he discusses with Manny a lot