About 20 Central Union High School students gathered at the school district board meeting in El Centro on Tuesday night in an attempt to have history teacher Simon Marquez returned to the classroom.
Marquez was one of three teachers notified by the school board March 15 that their contracts would not be renewed.
While the other two teachers remain at Central, Marquez was dismissed and escorted off campus the next day.
Neither the board nor administration would comment on details of Marquez's dismissal.
"We're lost right now," student Jennifer Mendivel, 17, told the board during the public comment session.
Mendivel said the substitute teacher serving for Marquez has not adequately replaced him.
She told the board the class' productivity has declined since Marquez's dismissal.
Students said Marquez was more than a teacher, and was a mentor who devoted much time to after-school activities and guidance.