Sitorus is a Bachelor in Law from Christian University of Indonesia. He also has a Master-of-Law degree from Tarumanegara University majoring in Intellectual Property Law. With an extensive intellectual property law career for almost 40 years, Sitorus is a renown professional for trademark, patent and copyright practice. He is both a flexible negotiator in ADR and a tough litigator before the Indonesian Trial and Appellate Court to secure a favorable outcome for clients in any dispute involving IP. He is now the director of LSP PARTNERSHIP and responsible for the management and day-to-day operational activities of LSP.

He is a member of Asian Patent Attorney Association, International Trademark Association (INTA), and Association of IP Firms (AIPF).