Sahat Siahaan joined ABNR in July 1996 and became a partner in January 2010. He graduated from the University of Indonesia, majoring in law on economic activities. In 1996, he earned his graduate diploma in legal studies from the University of Canberra, and in 2002 his LLM degree from the University of Western Australia in Perth.

Sahat specialises in corporate and commercial disputes, especially in the areas of corporate, banking and finance, shipping, commodities, insurance, mining, oil and gas, and investment-related claims.

He represents foreign and domestic clients both in domestic and international arbitration proceedings, and also advises foreign clients in relation to issues regarding the enforcement of foreign arbitral awards in Indonesia.