Johnson also worked at Frensham Heights School, Surrey.
Housemaster kept indecent photographs of young boys
Magistrates at Redhill also ordered Mr Johnson to register as a convicted paedophile with his local police at Brighton, and inform them of any change of address, and alert any other force if he stays away from home for more than 14 days.
Johnson had pleaded guilty at an earlier hearing on December 15 to four charges of possessing indecent photographs of children.
Steve Ash, for the Crown Prosecution Service, said the photographs were discovered following anonymous letters sent to both the headmaster of the Yehudi Menuhin School and Leatherhead police, accusing Mr Johnson of being homosexual with a predilection for young males.
The letters said it was a scandal that he was teaching there.
Mr Ash said Johnson was fully co-operative. Nothing was found in his living quarters in the school, but he admitted he had pornographic material at his private home at 37 Kensington Place, Brighton.
A police search in Brighton revealed photographs which he had bought from a local shop and notebooks containing sexual fantasies. Mr Ash said Johnson described them as a sort of safety valve.
Many items of a pornographic nature were found and he said police described it as a shrine to young boys.
Linda Filby, defending Johnson, said he had readily admitted the charges and co-operated fully with the police. He had no previous conviction and the probation service recommended community service.
Mr Johnson had been employed for a number of years at Frensham Heights School. For 11 years he was assistant house master, she said. For nine years he was at the Yehudi Menuhin School, over eight years living in and six years as house master. He only relinquished the post after a co-educational unit was set up, but he continued to teach there.
No allegations have been made against Mr Johnson from pupils, staff or anyone whom he has come into contact with while teaching at either school.
Miss Filby said several schools across the country had received similar anonymous letters regarding members of their staff and the information in them indicated a lack of specific local knowledge.
The pornographic material in the charges came from magazines Johnson had bought from a Brighton shop, she explained. He bought them openly on the open market. He did not realise it was an offence to have it. If he had realised, undoubtedly he would have disposed of it. He had used the material very much in the past.
He has lost a career that he had for at least 20 years and which he dearly loves, and you can see from the number of testimonials that he was held in high regard by the schools and pupils.
He was working in such a small unit where there were only three residential full-time carers. It was very much a case of him leading by example and he was open to scrutiny at all times.
It was clear his position was taken extremely seriously, and one of the letters shows that he is a considerable loss to the teaching profession.
Miss Filby told the magistrates that Johnson was finding difficulty getting a new job, and hoped to find a post caring for elderly people.
The magistrates accepted that there was never the slightest suggestion of inappropriate conduct nor any suggestion the material was for distribution, and sentenced Johnson to community service.