General Sir John Kotelawala Defence University (KDU) located at Kandawala, Ratmalana, Colombo, is a joint services academy where cadets of the three wings Sri Lanka Army, Sri Lanka Navy and Sri Lanka Air Force are trained before they go for their pre-commission training to their academies.
Thereafter he started a manufacturing company with his brothers named Sigma Industries which began operations in Ratmalana, in August 1985.
He later married his wife, Mangalika, and moved to Ratmalana.