The 60-year-old is the vice-chairperson of DAP as well as Pakatan Harapan vice-president.
As a people’s fighter, he had led the legal team for M Indira Gandhi who fought for the unilateral conversion of her three children to Islam, which was later declared as null and void in a landmark Federal Court decision in January this year.
The second youngest of nine siblings who grew up in a rubber estate, Kulasegaran received his early education at Anglo-Chinese School in Sitiawan.
After completing his law degree in Lincoln’s Inn, London, he established Kula & Associates, which started operating on May 1, 1985.
He was called to the English Bar in July 1982 by the Honourable Society of Lincoln's Inn, thereafter he was admitted and enrolled as an advocate and solicitor of the High Court in Malaya in 1983.
Kulasegaran joined DAP in 1983 after being introduced by late DAP stalwart P Patto.
In the 11th general election, he won the Ipoh Barat parliamentary seat for the first time after beating BN candidate Ho Cheong Sing by a slim majority of 598 votes.
In the 2008 general election, he secured a solid win by a majority of 15,534 votes, beating BN's Yik Phooi Hong.
In the GE13, the DAP vice-chairperson successfully defended the Ipoh Barat seat and again retained the seat in the GE14 on May 9 by beating Cheng Wei Yee from BN.