In such situation (I mean, sentence # 1), some possible ways:
(Parents) and students are rallying behind the teacher (teacher could be his name as well).
Parents and students are rallying behind the teacher and petitioning the school to allow him to remain at the it/the school.
Parents and students are showing support for him (on social media, etc)...
Parents, students, and teachers have expressed an outpouring of support for Olson since he the word got out he was being fired. They want the school to reverse its* decision.
*It could be the dean/school principal, etc. - to reverse his decision.