Our People

IDSP Partner

Indra Siallagan

Indra Siallagan is the Managing Partner and founder of IDSP, bringing over 25 years of experience from his roles in the Indonesian Tax Authority and as a representative for both multinational and local companies. He graduated from the Indonesia State College of Accountancy (STAN). In addition to being a Certified Tax Consultant, he is also a lawyer licensed to practice in both Civil and Tax Courts.

Muhammad 'Abdur Rozaq

Rozaq is a Partner at IDSP and has extensive expertise in international tax and transfer pricing. He graduated Cum Laude from the University of Indonesia (UI). In addition to being a Certified Tax Consultant, he is also a licensed tax lawyer authorized to practice in Tax Court.

Senior Associates

Cornelia Flavi Anasari

Cornelia is a Senior Associate at IDSP, specializing in Tax Audit, Tax Objection, and Tax Appeal. She graduated from the University of Brawijaya and is a Certified Tax Consultant. Additionally, she is a licensed tax lawyer authorized to practice in Tax Court.

Diana Putri Agustin

Diana is a Senior Associate at IDSP with extensive knowledge in tax research, tax disputes, and litigation. Her extensive research has helped win several landmark cases in the Tax Court. Diana graduated from the University of Indonesia.

Nadia Saleh

Nadia is a Senior Associate of IDSP with extensive knowledge of International Tax and Transfer Pricing. Nadia graduated from University of Indonesia (UI) and ABFI Perbanas. In addition to being a Certified Tax Consultant, she is also a tax lawyer which license to practice in Tax Court.

Thessalonica E. Eka Puteri

Thessa is a Senior Associate at IDSP with extensive knowledge in tax audit, tax objection, and tax appeal, graduating from the University of Brawijaya. Thessa is a tax lawyer licensed to practice in the Tax Court.

Junior Associates

Dyanes Sarai Puteri Rezeki

Muhammad Mahdi

Naomi Dova Nathalia S.

Nur Hayati Fajriah

Syamsu Erwin Darmawan