21. And in Boston, principals cannot rehire promising first-year teachers if senior instructors want the novices'jobs. 22. From 1810 onward, he worked as a senior instructor at the Collegium Fridericianum in K�nigsberg. 23. At the back of the classroom one evening, senior instructor Mark Moore rated their performance. 24. Mike Minard is a Senior Instructor at the Minard Goaltending School after playing 13 years professionally. 25. Ratner joined the staff of the Voroshilov General Staff Academy as a senior instructor in 1943. 26. The Senior Instructor qualification is targeted at those who only intend to work on artificial slopes. 27. Between 1988 and 1992 he became a senior instructor of Japanese in the University of Seville. 28. Appointed a senior instructor at the 23rd Army in 1941 and promoted to lieutenant-general in 1943. 29. He was in the same year appointed senior instructor in field works at the Royal Military Academy. 30. Wu Ying-hua was the senior instructor of the Wu family from 1983 until she died in 1996.