Mr. Siwantoro, Graduated from the Faculty of Law, University of North Sumatra as a Bachelor of Laws with a Civil Law Specialization Program and from the UNTAG Semarang Law Program as a Master of Laws, he has the work experience as a lawyer for the National Land Registry Office in handling and resolving cases of land conflicts and disputes. He has also assisted many clients in resolving land disputes with the experience gained during his 20 years at the National Land Registry Office before he works for LDN Ernst.

In addition, he is an official member of the PERADI Advocates organization.