Dileepa is a biostatistician and his interests are on spatiotemporal modelling of neglected tropical diseases. He has developed risk maps for snakebite incidence and soil transmitted helminth infections prevalence in Sri Lanka.
Dileepa is a Commonwealth Scholar and undertook his PhD research work at CHICAS. He has research collaboration with CHICAS, Lancaster University since 2014. He has visited CHICAS as a visiting researcher many times.