Former teacher Enoch Burke turned up at Wilson's Hospital School in Co Westmeath today as the new term got underway.
It is seen as an indication that he plans to continue to protest against his dismissal from the school.
It is reported that when Mr Burke arrived earlier he took up position in a corridor.
Earlier this year the High Court ruled that Mr Burke's suspension from Wilson’s Hospital School was lawful.
After being held in contempt on the first day of this High Court hearing back in March, Mr Burke was told to leave the courtroom.
By refusing to purge his contempt, he was not allowed back in.
In his absence, Mr Justice Alex Owens heard evidence of Mr Burke’s behaviour after his principal sent out an email in relation to a student’s wish to transition.
He heard allegations of Mr Burke "exploding" at a staff meeting and disrupting a celebratory mass at the school with students present.
The Board of Management later decided to suspend him on full pay and it sought a declaration from the High Court that its decision to do so was above board.