They spotted a gap in the market following the introduction of local management of schools.
The company, which began in the backstreets of north London, now has a network of 10 offices across the UK and seven centres in Commonwealth countries.
The agency has provided more than 30,000 teachers to 6,000 schools and supplies more than 6,000 teachers a year.
Last year its turnover was pound;31 million. It charges around pound;170 a day for each teacher, from which it takes its fee of about pound;50.