NSW teacher allegedly assaults four girls

A male teacher from a primary school on Sydney's lower north shore is behind bars accused of indecently assaulting four girls aged between 11 and 12.

The 51-year-old was bundled into a waiting police van after officers arrived at the front door of a Russell Lea home about 7.30am on Wednesday following a month-long investigation.

It is alleged the teacher, who most recently worked at Mowbray Public School at Lane Cove, indecently assaulted his victims at a school on 13 occasions.

He has previously worked at a number of other Sydney schools including the elite St Joseph's College Hunters Hill, Marie Bashir Public School and Harcourt Public School, according to his Linkedin account.

"Specifically the secret to my success has been in translating the education experience in an accessible and engaging way for all, be it young students, teen students, parents, adult learners and recent refugees to Australia," he posted.

"I also make sure it is fun along the way."

A Department of Education spokesman told AAP on Wednesday the man arrested by police was not currently employed by the department.

Police seized a number of items from the Russell Lea home as part of their investigation.

The teacher will face Burwood Local Court on Wednesday.