Concerned alumni, students and parents will meet at Hawthorn Town Hall on Wednesday evening to push for the reinstatement of Mr Brown and discuss motions of no confidence in the council and school principal Dr Michael Davies.

The ongoing disruption at one of Melbourne's most exclusive schools has resulted in some school-based VCE  assessments being delayed until the end of the week.

Earlier on Tuesday, Tim Sharp, who sits on the Old Trinity Grammarians committee and is the organisation's former president, said headmaster Dr Davies needed to stand down. He told journalists stationed outside the school that the council should also be replaced.

He said Mr Brown was the 152nd staff member to have been moved on in the past four years under Dr Davies.

"We felt that we needed to act, that the school was just heading in such a poor direction that we needed to resort to this quite extraordinary ploy,” he said. 

He said he was concerned about the boys, the school's reputation and staff.

The stoush is about a lot more than a haircut. It's a power struggle between the old and the new, and the future direction of the school.

In December, The Age revealed that the president of the Old Trinity Grammarians Association had raised concerns with the school about its new unwavering focus on ATARs, fundraising and new buildings.

Mr Brown was sacked on Thursday after snipping a student's hair for school photos. He gave the student a trim so that he complied with the school's strict grooming rules, which state that hair must be above the collar.

The student's parents raised concerns about the incident, but these were later resolved. However the school said Mr Brown's actions were inconsistent with community expectations.

Former chairs of the school council, alumni, parents and students have all hit out at the decision.

On Monday, the Old Trinity Grammarians demanded the principal and school council stand down over the dismissal of Mr Brown.

More than 50 former captains and vice-captains signed an open letter declaring they had lost confidence in the school council and were unhappy with Dr Davies' leadership. 

Education Minister James Merlino said he supported students expressing their views.

"We encourage students to have an active voice in school communities," he said. "I would see no problem in students expressing their opinion,” he said.

However, Mr Merlino said the state government played no role in the dispute at the independent school.

"From what I’ve read and from what I’ve heard it seems a pretty harsh penalty. But I’ll leave it to [the] Trinity school community to resolve this issue.”

Liberal MP for Kew Tim Smith praised Mr Brown's teaching career and issued his "heartfelt pleadings" to reinstate him.

Mr Smith described the deputy principal as "one of the old school of the teaching profession".

"Frankly, Browny is a bit of an acquired taste. But he does call it as he sees it," he said.

The opposition education spokesman will attend a meeting at the school tonight. Mr Smith said constituents had spoken to him on Friday about the matter. "It is a really important local issue in Kew," he said.

Mr Smith said he did not condone "random" haircuts for students but described Mr Brown's conduct as a minor infraction.

with Benjamin Preiss