Rajasingam was born on 28 March 1961 in Kuala Lumpur. He obtained his early education at Pasar Road School and later at Cochrane Secondary School and College Tuanku Abdul Rahman. He then graduated from the University of Wolverhampton in 1995. He is a Barrister at Law and was admitted to Lincoln’s Inn (London) in 1995 and called to the Malaysian Bar in early 1997.
Rajasingam began his early days in his legal profession by chambering in the firm of Sidek Teoh Wong and Dennis under the guidance of Mr Dennis Appaduray. He worked closely with Mr Dennis and gained invaluable experience in all areas of major litigation matters and corporate work. He later joined the firm of Kitson Foong as a partner and in December 1998, he joined Syed Paul & Co. also as a partner before joining Zainudin Wan Nadzin Chua & Mazlinda, and forming the Kuala Lumpur Branch with Karminder Kaur. He worked very closely with the partner of his branch, partners of the other branches and also with his staff who had been with him since the formation of the branch.
Rajasingam was a man of great charisma, jovial, friendly and ever ready to help anyone at all times. He had put everyone in his life before himself and had touched many hearts. He had never expected any recognition in return and will always be remembered and treasured. He was adored by his loved ones, his staff and people who knew him well.