Associate, Luhut M.P. Pangaribuan & Partners, 1999-2005. Associate, Situmeang Hassim Law Firm, 1998-1999. Professional Legal Drafting, Jakarta, December 2006. Participant: Cyber Law Course, 17-21, July 2006, arranged by FHUI; Seminars on the Industrial Dispute Settlement, February and July 2006, Jakarta; Seminar on UNIDROIT Work on International Commercial Contracts, Finance and Arbitration, and Its Relevance for Indonesian Business, November 2005, Jakarta; Seminar on Bankruptcy Law, Jakarta, September, October 2005; International Entry Course of the Chartered Institute of Arbitrators (East Asia Branch), Jakarta, April 2005.