A well known authority on Trade Remedy Laws such as Anti-dumping, Subsidies and countervailing measures, Safeguards, and WTO laws. Personally handled more than 200 cases [70-80 in EU/USA and 120-130 cases involving exporters. An expert on Indirect Taxes (Excise, VAT, Service Tax, GST and Customs.

He is also involved in WTO trade remedy laws in Geneva. He was instrumental in setting up the anti-dumping directorate in the Ministry of Commerce in 1994/95. He has handled personally more than 200 cases [70-80 in EU/USA and 120-130 cases involving Indian exporters and domestic industry] and has trained many people in India in this area.

Parthasarathy is also an expert on Indirect Taxes – erstwhile excise, VAT and service tax and currently GST.

He is also an acknowledged expert on all aspects of Customs [with special emphasis on Classification under HSN and Valuation] and Foreign Trade Policy.
He is involved both in advisory and litigation in all the above areas.
He has also handled Income tax cases.

Parthasarathy is also an expert on IP laws, particularly in Patents, Plant Variety protection and Biological Diversity law, both advisory and contentious.