Justice Kamal Kumar acquired his Bachelor of Law from Queensland University of Technology, Australia in 1999. That same year, he was admitted as a barrister to the High Court of Australia and the Supreme Court of Queensland. From 2000 to May 2013, he was a lawyer at Young & Associates, Solicitors, Lautoka, Fiji. He became a judge in the High Court of Fiji (Civil Division) from May 2013 to 7 April 2019. He has been serving as Acting Chief Justice since 8 April 2019.
In September 2018, he was also appointed as chairperson of the Fiji Human Rights and Anti-Discrimination Commission.
In terms of community service, from 2001 to 2006 and again from 2009 to 2012, he was president of the Lautoka Branch of the Dakshina India Andhra Sangam of Fiji. He eventually became national president of the said organization in 2012 and continues to serve in such capacity until the present. He also held various positions in the Rotary Club of Lautoka, the District 9920 Rotary International, and the Board of Visitors, Lautoka Hospital.