Thiru is an Advocate and Solicitor of the Supreme Court of Singapore. He is a legal associate with Regent Law LLC and was called to the Singapore bar in 2002.

Thiru holds an LLB (Hons) degree from the University of London and an LLM from the University of Johannesburg, South Africa.

His practice covers both criminal and civil matters. He also conducts lectures and seminars on business and company law for various educational institutions.