A former school teacher was found guilty at St Albans Crown Court of three counts of indecent assault and one count of sexual assault.
The first three offences took place between 1980 and 1986 while Mr. Michael Curtis was employed as a science teacher at Heath Mount School in Hertford while the fourth offence took place in Kent in 2010 and was also linked to his role as a teacher in a different school.
The victims were all male and under the age of 14 when the assaults occurred.