In 1991 Eng.Gunasekera commenced his Entrepreneurial activities as the Managing Director of his own Project Management Company LAN Management Development Service (LANMDS); a well established and recognized; dedicated Professional Project Management Company in Sri Lanka.

Eng.Gunasekera served as the Chairperson of Union Chemicals Lanka PLC. Since 2003 up to his passing away. During his period as Chairperson the Company’s turnover grew from Rs.161,000,000/- in 2001 to Rs. 594,000,000/- in 2010. The market price per share which was at Rs.41.75 in 2001 rose to Rs.800/-(+)per share in 2011. In addition the following awards have been won by Union Chemicals PLC. during that period.